Is OTHER wrong in the post ? POST : Last Saturday my girlfriend (well call her J) decided to break up with me, the breakup obviously wasn't pleasant, but it was by no means nasty. We had been together about 4 months and were pretty serious about each other. We would spend practically all day together and text into the early morning. Later that saturday J sends me a text to make sure I am alright, because she still cares about me. I tell her I'm alright, but the only way I can move on, is to find someone else, to which she says okay, we stopped talking for the rest of the weekend. 

The next day, I feel lonely and just overall broken, so I took to tinder, I ended up getting a couple matches, including K, who I got to know and she is really cool. We have a lot in common, and get along real well, so I ask her out, she says yea and we tried to find a day where we both can. I felt pretty good, and went to sleep.

Yesterday, I was at home and recieved a text from her, asking about a friend giving her a ride, after no response from him, I end up giving her a ride. We talked and had a good time, which was the opposite of how I thought it would be. She ends up asking me for a ride home after, to which I agree, later I pick her up, and we go to talk. She takes my phone to put on music and finds that K sent me a message, she goes to check what its about, and gets a little jealous, but we end up moving passed it and talking about other things, including possibly getting back together. She ends up holding my hand while I drive home. That night, she texted me asking me about K, and is asking me why I'm talking to her instead, we talk until around 11:30 and then she says goodnight.

This morning, I said goodmorning to J, and after I ask how she is she said, idk. When J says idk, it usually means something is wrong, I was pretty sure it was about K, but she wouldn't respond to anything I said. I tried to talk to her in the hallway, she said she was alright, after that, the only thing she would say to me was, go talk to K, just go talk to K.

My friends say I did nothing wrong, except for one who says I moved on way too quickly, and am trying to hurt her. AITA?