Boyfriend keeps bringing up my past reltionships?

I have been dating my boyfriend for a while and I am his first girlfriend. I have dated guys before him but I was a teen when it happened and he forgets about it for a while and randomly brings it up. I didn't do anything bad or extreme and I never lied about it. I dont know what to do I feel like I am constantly in trial? I always reassure him and I changed a lot for him. I always felt bad about it but I didn't even know he existed at the time. Any advice?

Boyfriend keeps bringing up my past reltionships?
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