Throwaway because my main account is easily traceable to me.

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I say might have cheated, because that's grey area. It's kind of a long story. 

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%%Establishing some background info and the setting

I  (M 18) left my girlfriend (17, now ex) in August to go off to college and do my thing. We attempted long distance, and it had its strains. Ultimately, I still maintained my strong feelings for her, and it seemed she maintained her feelings for me. She started working at a small restaurant and I started working as a tutor. Her place of work was far-ish away, so she'd often ask me to buy her an uber to get her to work if she couldn't make the bus (she didn't drive). She'd often do things that made me uncomfortable (her going to frat parties when she's not even in college yet, getting high with my friend "Evan" and driving around), and I'd bring it up with her but she'd end up getting mad. Not trying to be controlling, I backed off. This was fairly frequent. My friends at school suspected they had a thing going, but I trusted both of them. Important note: I have known Evan for 10 years, he's only known my GF for a little less than I had known her, but they became quick friends. Because of this, I'd often ask Evan to mediate some issues or to give me my GFs opinions on things when she was mad at me and refused to talk to me. But I digress. 

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A few months pass and I get four days of break to fly back home. She's completely cold, despite the warmth she'd shown me just hours before when talking on the phone. I get worried and admittedly kind of clingy, and try to figure out what was going on. Me, her, and Evan hang out and do our stuff. I asked Evan what he thought of it, and he kind of got mad at me for always going to him for his opinion on my relationship. My GF says she want's to take a break, saying "We'll still be dating, but we just won't have the romantic part of it." I reluctantly agree, because I still have feelings for her. I fly back to school.

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She still tells me "I love you" and all in all it seems nothing has changed and that we weren't even on a break. Once she started telling me she loved me I figured that the "No romantic part" was rescinded and told her how I felt and how I don't like breaks in a long text, which in retrospect was seriously cringey and weird. She breaks up with me a week after the break starts, but tells me she "Doesn't want me to move on". 

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We still talk everyday after the breakup, she still tells me she loves me, and I still have feelings for her, but when I express those feelings she gets mad at me. (Side note, I'm still ubering her to and from work, to the point where almost all of my tutoring money is going to that). About a week later I tell her to stop sending mixed messages, to which she calls me a child. We decide to stop talking to each other. 

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%Get to the AITA already!

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So after that incident, plagued with many negative emotions, I log into her snapchat and look at the messages between her and her friend. What I learned is that she had slept with her manager (M19) two days after we took the break/five days before she actually broke up with me. She had also been telling her friends that we were broken up months before the fact. 

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I ask Evan, despite what he told me a month earlier. He gets mad at me for logging into her snapchat and says it wasn't cheating because it was a break (This is the grey area I referred to). I confront my ex about it but I honestly don't even remember what she told me. Cut off all contact with her since then. 

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AITA for logging into her snap for this info? 

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%AITA Part two:

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When talking to Evan about it, he kept defending her. All the information he was getting about what had happened in the months prior was coming from her. He didn't bother to ask for my side of the story once. 

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I tell Evan about the shit my ex talked about him behind his back. He called me a piece of shit for lying, but then said he didn't care when I showed him evidence. I asked why he was getting so angry with me and asked if it was because he had feelings for her (he clearly did, but he denied it). He has not talked to me since. 

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AITA for bringing this up with, and accusing my (now former) friend of having feelings for my ex? 

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%Additional info

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I see now she was kind of manipulative and I was kind of clingy. She accused me of trying to "Buy her love," despite the most expensive thing I got her was a $150 piece of shit laptop so she wouldn't have to use her brother's to do homework.  Second most expensive thing was a $10 book (or ubers, but she requested those). The relationship was an overall train wreck, but of course I didn't see that when I was in it. 