Toxic Traits

I have been through many relationships in my 18 years of life and only recently have I realized that during that time, I have picked up a lot of toxic traits that have stemmed from how I was treated in past relationships. For example, one of my exes used to hide his phone from me all the time and would talk to other girls behind my back and because of that, I have extreme trust issues now. Another ex used to always tell me I was the problem and always picked at everything I did and said it was because he loved me and wanted me to be better, even over the dumbest things which now causes me to create problems in my head. I am in the best relationship I have been in thus far, and I feel like I can see myself with this person for a long time. But the problem is, I feel like I keep being toxic and not realizing it until after the fact. I start fights and arguments just to see if he would care and I accuse him of extremely irrational things because of my trust issues. I don't want these toxic behaviors of mine to be the reason I lose this amazing guy for good. How do I heal and fix these toxic behaviors before its too late?