<human>: Can you provide a brief overview of the text?

I don't know how to deal with it.

They dated for about 4-5 years and she ended up cheating on him with some shady guy, and really broke his heart.
Then he told me they hooked up a little while after that, and then he eventually stopped the year before we started dating.

What concerns me is she's very hostile when they talk to each other.. As if he was the one that was at fault for their break up. She talks to him as if she wants to be with him (and at the beginning of our relationship, she actually made verbal ADVANCES toward him). She still behaves as if she likes him.

He states he forgives people for their wrongdoings, because everyone should be forgiven, just not forgotten. He states that being nice to her is his way of "killing her with kindness," and I view it as his way to cope with what she did to him. But she brings up so many little conflicts, it seems like it takes more energy to talk to her than it does disconnecting her from his life completely.

What I don't understand is why he still wants to be friends with her if she is constantly passive aggressive, and he complains to me about it when she says ridiculous things. All I can think is, "Then don't fucking talk to her," But I'm not going to tell him that he can't talk to somebody... I feel like it's not fair for me to control him like that.

We've talked about it a few times now, and he assures me that he will never be with her again, etc. But I can't tell if he's just saying that to make me feel better. I know I have a minor trust issue, because of my past relationships, but the whole situation makes me really uncomfortable and frankly, pretty angry. I want to trust him to my fullest when he talks/hangs out with her, but I just feel really unsure about it all.

We've been dating a year and I love him dearly. I don't think I could ever find anyone that suits me better. I just don't know what to do about it.
<bot>: boyfriend still wants to be friends with his ex gf of 5 years, even though she is a passive aggressive, disrespectful person, who consistently show signs of still liking him, and I don't understand it.