my fiance admitted that he thinks about cheating on me

so my fiance has a past of cheating on me with cam girls paying thousands of dollars to live stream girls. we broke up 3 times over it and got back together cause he swore he's changed. he started going to church. anyway yesturday he was talking on the phone with me. and he brought up how when he thinks of watching porn or paying live stream girls. either he's at work and I call him or our daughter cries or he sees people in their cars watching porn. they way I took it is he wants to cheat on me but hasn't found the perfect time to do it. what I'm very bothered by and hurt is that he thinks of cheating on me and destroying our family yet again. when he got home from work I asked him about if he thinks of cheating on me and I brought up all the examples he told me. he freaked out and told he worded it wrong. he started yelling at me and went out on the couch to sleep. normally he'll calm down and tell me that he's not cheating or anything. not this time. I think he's guilty. cause I don't understand why he got so mad and went to sleep on the couch. he also said when he thinks about us trying something in our sex life he thinks about looking girls up to see other people do the sex position he wants us to try. and all of a sudden we are trying all different kinds of sex positions. is he lying to me or am I being crazy?