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

Hey! First post here.

So, my GF broke up with her ex of 2,5 years about 8 months ago. I know she is over him, and that she just wants to hang out with him as a friend (their relationship was horrible at the end, but they agreed to break up, with no hard feelings).

Still, I can't relax about it, as this is my first serious relationship. I am not going to deny her hanging out with him, as I trust her completely. Yes, we have talked about it, and she told me the story of their break-up, and told me that she really enjoy our relationship, and that after all, she is with me.

So, guys! What can I do to accept this? I want to learn to live with it, as this is just my mind playing with me.
<bot>: My GF is hanging out with her ex, they are just friends, and I need tips on how to accept it.