u/Formal-Spinach-4506

I’ve been talking romantically with someone who told me they struggle with retroactive jealousy. I found this subreddit, and I’m seeking advice from people who have had partners that were able to help with this. I really like this person, and I want something serious with them, but they worry a lot because of my romantic and sexual past. Sometimes when they bring up my sexual past, it feels like they're attacking me or calling me “ran through,” so I tend to get defensive, and I think it only ends up making things worse. I’m starting to feel doubt about if I can really handle this because I try to reassure them a lot, but it doesn’t seem to help. What should I do?