<human>: Can you give me the gist of the text in a nutshell?

He met a girl a few weeks ago. He told me that she confessed attraction for him and that he told her he had a girlfriend and wanted nothing more than friendship with her. He said that he wasn't attracted to her and that, when she asked what he was doing while he was with me, he would be sure to throw in that he was with his girlfriend in order to try to reaffirm the fact he's unavailable. 

Recently I had been feeling very nervous around him, and it felt like he was hiding something. He told me that, during the week we weren't together, he went on a date with her. He assures me nothing happened. I asked what else he was lying about, and he said nothing. After hours of him saying "Well, I wasn't being honest when I said ____, but that's all," (slowly adding to the list of lies), it came out that none of what he said was true.

* She doesn't know he has a girlfriend.
* He's attracted to her, and he has told her.
* They hang out alone (in date-type situations, and he was denying it to me.
* He claims to not want to do anything with her.

I am not sure what to do. I'm very angry and hurt. He says he is going to tell her about me, and even mentioned being fine with never talking to her or seeing her again. Any advice would be really lovely.
<bot>: Boyfriend of 6ish months is hanging out with a girl he has mutual attraction for. She doesn't know about me, and, until last night, I didn't know about her. What do?