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

We've talked about it a lot and I've voiced my concerns and discomfort with the situation and she's apologized for putting me through it because she never fully got closure. I've never been in a stronger, more open relationship in my life and I've never been happier. She'd never cheat on me, and this situation isn't enough to make me not want to be with her, it's just frustrating. We'll be watching television or out at dinner and I'll see his name pop up on her phone and it immediately puts me in the foulest mood. Am I being unreasonable for finding this upsetting? I have been making progress here with mood-control, it's just a pain in the ass and I feel like she is too focused on this communication with him to focus on being in the present with me. She's over him, I know that, she just values the relationship. Is it okay for me to just take some time getting used to this? It doesn't help that I find him insufferable for a list of reasons she's let trickle out over the five months she and I have been together. He just seems like a terrible person.

Anyway, I might just be ranting here, but thanks for reading regardless.
<bot>: Girlfriend of five months likes to keep in touch with her shitty ex-boyfriend, I don't feel comfortable with it and want advice on how to get over myself about it and if I'm being unreasonable for feeling this way.