Am I wrong for this?

So I know this girl I went to high school with. We used to hang out in high school because we had the same group of friends. I’m currently 25. I stopped talking to everyone from high school once I went away to college. I’m currently living back close to home and have been hanging out with the girls ex boyfriend. We’ve been hooking up for a few months. I recently was told he’s seeing someone else too but like what we have is nothing serious. He hasn’t mentioned anything to me about another girl. I’m dating around too. Am I doing anything wrong? Like I feel a little guilty but at the same time I don’t. He’s 30 and I obviously don’t take him serious but he always seems to come looking for me. 🤷🏻‍♀️i dont know