Help!

Okay, so a couple of weeks ago I lost my virginity to one of my good friends. He knew I was a virgin before it happened, and during we talked about how this was going to be just bit of fooling around, not a relationship, as he has 2 girls with another women and it'd be complicated, as well as my ex boyfriend being a good friend of both of us. However he still decided to make a move on me, he started everything and it was a good night, not something I regret. Recently however he's been weird with me, he seems distant, we're still the same when we're together, still flirting back and forth, but when it comes to texting and stuff he's cold with me.

Does he regret what happened? Does he think I want more than just some fun? Is he having different feeling towards me? I'm. So. Confused...