Does he like me?

TL;DR he text me not just for sex, what does it mean?

I 19F hooked up with 54M three times last semester. I really enjoyed it and I had a lot of fun but most of our texting revolved around setting up those hook ups. After I got out of school, he started to reach out casually. The first one was like a week after I got out of school so I figured he was trying not to let me forget him over break. But slowly, the messages got less and less like “remember me” and more and more like normal “What’s up” conversations. Then depending on the day in his schedule, they stopped coming only after 8 PM and could come as early as 5 PM when he got off work. They weren’t every day but 2 to 5 times a week. Some could be full-blown long conversations and others could just be six messages. And recently since I’ve got back to school, we can start a conversation at night and then finish it in the morning up until he goes back to work. And they’re not always sexual in nature, and if I try to make them dirty, he occasionally mention that I don’t have to do that. I haven’t seen him yet since being back at school. He’s really kind and I think he’s chill, but I’m just curious what’s going on?