<human>: Okay, I [F25] fucked up. About a month ago, an ex contacted me out of the blue and asked me out to lunch. He was in town and wanted to catch up. Totally platonic. I told my boyfriend what was going on and he was completely fine with it. So I had lunch with my ex and that was the end of it. However, it seems I set a bad precedent because now my boyfriend [M26] thinks it's cool if we hang out with our exes.

We've been in a serious relationship for 10 months and have never dealt with past lovers before this.

His ex-girlfriend emailed him last week and apologized for treating him badly when they broke up. She said she "thinks about him all the time" and "regrets" the way things ended. She closed the email saying she hoped they could still be friends. He emailed her back, forgave her, and now they're buddy/buddy. In fact, they even went out for breakfast on Monday. Her birthday's next week and she's already invited him to her party next weekend. He said he's going.

I DON'T LIKE THIS. And I can't really say anything because that would make me a huge fucking hypocrite. I don't know what to say/do to solve this. He's been very open and transparent with me, so I don't feel like he's hiding anything. However, I don't like how this girl has suddenly become a good friend again. They texts non-stop as well.

The hell am I supposed to do?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: I had lunch with an ex. Now my boyfriend thinks it's fine if he hangs out with his ex (who I think still has feelings for him).