My triggers are messing with my relationship 💔

It’s tough having gone through horrible romantic experiences in your life. Something about getting cheated on over and over again, it leaves its mark. So in my current relationship (this man is wonderful, an actual angel on earth) I’ve noticed a lot of situations trigger me. Which usually leading to my relationship getting the short end of the stick. So I need advice. When in a relationship, how do you work through your triggers to overcome them? How should I explain this to my partner? I would love the help 🫶🏻