<human>: My boyfriend went on holidays with a group of friends and repeatedly cheated on me. I thought we were happy and everything was great until I found this out so it shocked me. I was devastated and so hurt and upset and it was so painful, but now I feel nothing.

He's really sorry and doesn't want to lose me, and has tried so hard over the past few days to show this to me. I don't want to lose him either, I love us together. We've had really long talks about what happened and why it happened and he's answered all my questions and listened to how I felt and been really open to talking about everything. He said his cheating was a 'drunken mistake'. 

I'm willing to move on because I really believe we're different to other relationships I've had and I really did care about him, he's my best friend, but for some reason I feel differently about him now. In fact I don't feel anything about him at all. I don't hate him, I don't feel angry, I don't feel sad I just feel nothing when I think about him. I used to feel so passionately in love with him, now I just feel a calm sense of "I don't care". I used to miss him when we didn't talk, now I hardly notice the time passing between when we see each other or talk. I used to get so excited before I saw him, now it feels like a mild inconvenience I have to get over and done with when I'd rather be somewhere else. 
I'm posting this here in the hopes that I can get some insight as to what's going on with me, I know I'm hurting him with my attitude but I can't fake how I feel, and I don't even understand myself why I just don't care about him anymore.

Condense the text into a few key points
<bot>: boyfriend cheated on me so many times, I don't care. It hurts him that I don't care. I don't know why I can't make myself care.