He wants to cheat on his girlfriend with me!

So I have this guy friend..he's been trying to get at me for a year now..long story short I kept telling him no seeing to it that he has a girlfriend..the thing is his girlfriend cheated on him..I knew him then when it happened and he was devastated and heart broken but he made it through..he's still with her..last night he invited me over and cooked for me..and we hung out until he fell asleep..I watched movies and then around 11 I left...when I was there the sexual tension was high..like 🔥🔥🔥..today now he's asking me to come over and sleep over..now we all know what'll happen if I do..but the thing is I'm hesitant and then apart of me be like girl go get laid (it's been a while 🙃) but I feel so bad..I told him "what kind of women I'd be sleeping with him knowing that he was taken?" He still hasn't responded yet, he's at work..but ladies how can I kill this urge..and what can I say to him to be final that hey you're taken and we cannot sleep together! lol like he's hot, charismatic, persistent..I feel like I'll give in soon..help me!! 😭😭😭

-Very horny, single babe.