Everything started nearly 2 years ago.A friend of mine introduced me to a group of friends. This girl was in the group,she was silent and introvert.We spend time as group, with time I started to realize this girl had some problems.

A night it was just two of us.I tried to talk to her,she was a bit drunk and spoke direct about herself,family problems.She was in a major depression,and was getting psychological support,using anti depressants.

After that we got closer.She was more comfortable when I was around. We go out together as friends.I really tried to help her about her problems. 

She started falling in love with me.When I understood it i introduced her to one of my close friend,I wanted them to be in a relationship because I didn't love her I just wanted to help her.She started to overcame her problems.

One day my bro called me and said she cheated on him and he was angry to me because I brought them together,he swore to me then blocked me everywhere.When i talked to her she said she is sad for what happened but I was still mad at her because she cost me a good friend.I didn't talk to her as much as before they broke up.

About 8 months ago we were in friends house,everyone got drunk except me.Gang were sleeping in living room,I went to the room of my friend,layed in bed.Later that girl entered the room.She was drunk suddenly she layed on me,i didn't do anything I knew she was drunk.I talked to her to get up but she said something about she love me and took her hand on my penis over my pants.I stood up and left the room in surprise and anger.She stayed in the room and fell asleep.

We didn't say a word about that night but she started to act different.She wasn't friendly to me at all.She was like manipulating the group.It was so annoying,finally i left the group and didn't talked any of them.

One month ago one of my friends from that group texted me.He said all of my old friends angry with me but he said he didn't believe to her.The story was like that "Everyone was drunk except me, she went into room and layed,after some time I entered room and started to touch her,she couldn't resist and we had sex".I shocked and felt stupid for all the things I have done for her.I felt bad but didn't care about it because I had already left the gang so it was not a big deal.

Two weeks ago I broke up with my gf I was in a bad mood didn't know what to do.That night I called that girl and told her to come to my house.She was like waiting for that moment,one hour later she came.We just had sex I told her I'm not serious about two of us,she said she doesn't care,she just wanted me.We didn't sleep together,said goodbye to her and we haven't talked after that night. 

Somehow me and my gf started again.I started to be called by the secret number.A crying girl voice swears to me.I know she is her.I don't know why she is mad at me she said didn't care when I told I m not serious with her.Am I the asshole and should I tell my gf about that night?