I miss him..

I have been talking to this guy i like for a while, we usually text eachother. But lately he has been distant, past 2 times i contacted him he cut the convo short. I don't understand whats going on. Should i wait to see if he texts me? Or should i text him and ask why he's being so distant? I don't want to ruin things if its just in my head, but it just feels different.