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

We've only been dating for 3 months, but I do see long-term potential with her. She tells me about all the guys she's been with, and she still hangs out with them from time to time (publicly, so not a problem) The problem is, she met me a month after her and her ex of 3 years broke up, and they decided that it's completely over with each other. She even told me that the night of the day she met me, she slept with him. Around 3 weeks ago,she says that she wants to see him for lunch, just to catch up maybe once or twice a month. I'm not a controlling boyfriend, so I don't say anything. I've told her that I really don't like the guy at all, but she doesn't say anything about that. She brings him up in our conversations occasionally, and I just change the topic slightly. Now, she sees him much more often, once or twice a week, and they started texting again. I wouldn't really worry about this, except me and my gf can only see each other every 2 weeks. I don't feel comfortable with them seeing each other, simply because I don't trust him. What am I supposed to do Reddit?
<bot>: Gf started connecting with asshole long-term ex, I'm uncomfortable with this, but I don't want to keep her from doing what she wants.