Confused and need advice

Ga

So basically I am currently on an exchange, I left my home country around a month ago and yeah I'm having a really great time. Blah blah blah this part is not the point but pretty much my point is i am really confused and kind of hurt because about two weeks before I left I had sex with a guy i've been talking to the whole year and hooked up with twice before. Please don't criticise me for this, I never go to see him because of work and we lived in different towns. Anyways we had sex and actually I don't regret it. (I'm fifteen by the way). The problem is though that me and this guy have some kind of weird relationship, not to mention we aren't actually darting, in our "relationship" we have never called each other on voice call and in snapchats we don't even show our faces. It sounds pathetic but in person we were complete comfortable with each other.

The reason why I am confused though is that he is moving to a town 5 hours from mine (I won't be back there for a year though) and i think that he will hook up with other girls and stuff before I get back even though he promises he won't. The problem is thought that every time I try to let things go between me and him we always end up talking again because he says something sweet and my emotions cave in. What should I do?!