<human>: Can you provide a brief rundown of the text in within 3 sentences?

I started dating this girl in January and due to some differences we broke up after two months. About a month ago, we realized how stupid we acted and decided to get back together. We've been dating for 1 month now and the thing that bothers me, is that she messages her FWB a lot. She had a FWB before we started dating. I found that out from her room mate. I didn't go through her phone but I can see every now and then there would be a message popping up from him. We haven't had the exclusivity talk yet. So is this a red flag or am I thinking too much about it?
<bot>: Dating a girl and she still contacts her old FWB. Is this a red flag? Could there be something going on between them?