<human>: Hey Everyone,
My girlfriend and I have been in a relationship for four months. I have known her since May 2015. > Yesterday, my girlfriend told me she was invited to the cinema by someone she used to work with. He is also an ex-boyfriend she dated for two weeks. Girlfriend asked me if I would be uncomfortable with the situation. I said, "Yes, I'd feel very uncomfortable because the cinema is something we do as a couple."

She said she is not going anymore. She said she felt like she had to ask me permission. I am her first boyfriend in two years. The whole thing made her feel a bit stupid.

I told her it is not about asking permission. I am not her father. I said it was about being okay with one another. I didn't want her to go because when they dated, I am sure they did sexual things together. I don't want to think about that. I do trust my girlfriend, she said she does not have feelings for him. I am just not sure he doesn't have feelings for her.

I really don't like the idea of a guy teasing my girl and trying to destroy everything we've worked on. And I know she wouldn't leave me (not by him lol) but it's really annoying to know that he's there like a lice in your pants.

So I think my question is if I was wrong by asking her not to go, she didn't get mad, she was very understanding but I'm worried she will begrudge me because of that. Have you ever been in a situation like this? What to do/say next?

Summarize the given text in a few sentences.
<bot>: GF got asked by his ex to hang out together, she asks me how I'd feel and I said 'very uncomfortable, please don't'. Am I a being an idiot? Sorry for my english!!