Struggling with Trust Issues in My Relationship

I'm so depressed lately I feel like I can't stand to wake up everyday. biggest contributor to my depression now would be my boy friend who is also the father of my children. we've been together for 3 years on aug 5th 2019. I got pregnant the first time and he started cheating and more..and same with our second pregnancy. it's been almost a year since last time he cheated on me that ik of. it's still completely effecting me and our relationship and my kids but I want to change and I want my trust issues to disappear anyone in my boat who figured out how to heal? all I'm finding is cheesy answers that don't work I'm desperate to feel better