He's back, should I keep talking to him?

Same guy, more problems. I stopped talkin to the guy for a while, but a few weeks ago we started talking again. He’s engaged but most definitely does not act like it. The 1st time after we started talking again and we actually talked, he seemed changed. He told me he missed me and loved me. He also said that he used to like me a lot but was afraid to say anything. Then he said, he wishes he would have told me and that he thinks about what it would have been like if he had told me. He also asked what my thoughts were on an “us.” I’m supposed to go to his house this weekend to hang out with his family and him.(his mom loves me) A friend of mine said she honestly thinks he will try something on me. When I asked her why, she said b/c everything out of his mouth towards me has to be sexual. I will admit, he does talk like that a lot but I don’t know. Another thing, that has me wondering is a picture, he sent me. Let’s just say the pic was rated R. After he sent the pic to me he kept asking what I thought about it and if I liked it. Then today, he basically told me if I wanted to have sex to call him. I told him no, he’s done enough. He asked why not him. I told him he was engaged and all he could say, was yea I guess that it is a good reason. I guess, I need to know if I should continue to talk to him as just his friend or just stop talking to him period. I don’t really want to stop talking to him but there is NO WAY I’m helping him cheat.