How do you really forgive?

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I had a question earlier about my recent ex that treated my bad while we were together. He has cheated on me. kicked me out of "our" house (That I payed 1/3 of the morgage every month and 1/3 of the bills) to entertain his mistress. He cororsed me out but locking our bedroom door so I couldn't get my clothes. He decided to invite half naked women to "our" housewarming and turned his head away when I tried to kiss him in front of them. He went to an ATM and made me get money out of my account to pay bills before we went to the hospital while I was having labor contractions when I was having my son. He ignored me in the delivery room. I couldn't even enjoy my son coming into the world because I was so hurt. I hurts because I still love him though I know I can never go back to him, and he wants to be a pert of his child's life at least finacially, (He came over one day and I had asked him to change his child's diaper, he got his 4 year old daughter 2 do it instead.) How do I forgive him?