Should I text back

I'm a 30 year old single mum, about 3 years ago me and one of my male friends who's also 30 started to hook up on weekends regularly as we were and still are both single, we met back in highschool when we were 14, we both have always just hit it off, we talk for hours about everything, we would spend time hanging out. About 12 months ago, when he would come over it would be just for sex and then he would take off, then it got to only coming over when he wanted to and it would only be in the early ,am, for sex and then leave. I was done when he got his friends to drop him to my place at 2am and told them to come back for him in an hour, so I told him I'm all for what we had, but a bit of respect because I was feeling like he was treating me like a hooker. He come over earlier a few more times and then he stopped calling, texting and coming over. I would text him to come over and have dinner, hang out, which meant sex, he would always just say not tonight, so I stopped texting him after 2 weeks realising for some reason he was done. From then til now we still see each other about once a month, when one of our friends is having a party or get together or sometimes my best friend, his cousin, and I will go up to his place to have drinks with him and his sister., so there is no awkward moments , we get along like normal and still sleep together when we catch up, I've told him how I feel, he knows I would be with him in a second , I think he's amazing. I just don't know what happened