You have no control over someone trying to contact you - plus, it sounds like you blocked and didn’t respond to them, anyway. It’s not cheating simply to talk with someone you used to be with (although I can see it could, potentially, be a slippery slope for some people) - for example, many people who split up might, later, be on good enough terms to be friends, especially if the split was amicable and maybe they had children together.
Your boyfriend sounds insecure if he’s this jealous about your past. I would agree he sounds controlling as well. If he’s calling you sexually derogatory terms as well that’s a red flag, to me. It says to me he doesn’t respect you.
It’s good that you realise why you acted how you did in the past, and that you’d like to avoid making those same mistakes, though.