<human>: Can you succinctly summarize the text in 1-3 sentences?

I'm unsure of what to do here because I've had some problems with jealousy in the past and I don't want to make any decisions clouded by my own over the top emotions. I met this girl at the end of last year and since then we've become extremely close. Everything has been great so far. We both live in different cities, I'm moving to be with her (other reasons as well such as job, family).

She broke up with her ex after what she described was an unhappy relationship for many years. She told me she tried to make it work but couldn't. They broke up early last year, he begged her to get back together and she did. After a while she realised she was in the same unhappy relationship and broke up with him again.

Anyway since then they've been amicable with each other (they share a pet as well as having a lot of the same fiends). She's expressed an interest in remaining friends which I would be fine with except from everything I've been told so far, he still loves her and wants to be with her.

I've been fine with her going out for dinner with him and their mates together, but the other morning he came around to drop the cat off and stayed to have a cup of tea with her. I felt this crossed a boundary and got pretty upset. 

When I spoke to her about it, at first she was pretty defensive, she didn't want me to tell her what to do. In the end she said if it's what I wanted she wouldn't be friends with him.

I don't know if I'm being unfair. For the first time in any relationship I'm trying to be honest and open, about myself as well. I'm not lookng for anyone to tell me what I want to hear, I just want to know what the right thing to do is.

Thanks for reading, it would be great if anyone could help.
<bot>: Girlfriend becoming close with ex who loves her (she doesn't feel the same), I'm feeling pretty uncomfortable about it.