Heartbreak :-(

I would really like some advice. I was with this guy who I totally adored, he made me so happy. And then one day he cheated on me. I broke up with him but then he was going through stuff with his family so I was there for him and stuff. But I cannot seem to get over him, I tell him I don't want to get back together but it's like he knows I am so in love with him he comes back to me and hits me with that "I love you". It seems like the only time he hits me up now is if he wants to have sex and of course I take in. I am still so heartbroken and cry lots and I cannot seem to get myself to cut him off. Pls let me know if u have any advice on what to do to make me more happier :)❤️