Did I overreact when I told my fiance we wont be getting married?

History: lies, cheating, betrayal, broken promises on his side; forgiveness, patience, tears, faith, support from me. I have major trust issues with my fiance because of his track record. Recently I discovered he has been on sites, watching movies and saving pictures of his favourite women. I challenged him, reminded him that I really dont like and wont accept it, and if he wants to do that he needs to be single. We are supposed to be getting married in April, but so far nothing has been organised. He must make an appointment for both of us to attend, regarding my converting to his religion, confirm the date, and discuss protocol & procedure for the wedding. Twice he has made appointment and broken it. I have spent hours searching and planning but I have not booked anything yet, or sent invitations yet, until the religious stuff is sorted, and we know the date is secure. Feeling panicky and down, I told him that I did not feel he wanted to marry me anymore because he is not doing anything. I walked away, expecting him to follow and hug me, talk to me, comfort me, but for the rest of that day and the whole next day he avoided me and gave me the silent treatment, whilst I remained obviously upset and teary. He left for work next day without saying goodbye and came home and sat outside for 45 minutes before coming in, and then ignored me for hours. I went to him, in tears, and told him that I dont think we should get married and that I dont feel safe and secure in this relationship because he wont give me the honesty and emotional support that I need. He didnt respond, gave me silent treatment for 1 hour, then hugged me and said sorry and that he loved me and that he had confirmed the date. This morning he left for work without saying goodbye again. My heart is breaking and I feel our relationship is doomed. Am I over reacting?