How to truly trust your partner after being betrayed in previous relationships

I feel like I am damaged goods from being betrayed in previous relationships in which I was lied to and cheated on or I used to cheat on their partners without their knowledge, making me the other woman.... No no no!!!!! What happened to honesty and loyalty?? Now I'm in a committed relationship with someone who I'm head over heels in love with but still find myself suspicious of his behavior like phone activity and it's driving me nuts! Anytime I convince myself to talk to him about it I feel like a mega insecure jealous psycho b**** and let it go. Have I between conditioned to think this way from past experiences? Or is it a gut feeling I shouldn't ignore? Feeling lost in the world of relationships, any advice or previous experience is much appreciated, thanks in advance!