Need Advice 🤦🏻‍♀️

My boyfriend and I have been dating for a couple of months now and he is just so wonderful. I truly am falling for him. My only concern is that he has a child with someone he was with for 9 years and even though that doesn’t bother me at all he does talk about his past life with her quite often. I have never mentioned it to him about how often he brings it up and I know it’s a big portion of his life but I can’t help but wonder if I’m just wasting my time. I would never want to silence his thoughts or filter his stories to me. I want him to be able to express himself without any restrictions but I just cant help but feel like a rebound. Should I have any concern over this?