Your best bet is to just lay it all out for him without sounding heavy or jumping to conclusions.
Sometimes I think my SO is distant, but he's really just busy with other things or overwhelmed with outside stuff. But I'm never sure until I call him and say, "Honey, we've been a little out of sorts and you seem distant. Is everything ok?" and let him know that you're looking for reassurance.
Definately talk to him. Don't jump to conclusions automatically. My boyfriend does this too sometimes and like other people have said he is usually just stressed with everything he has to do!
maybe right down all ur question and the things ur worrying about and then asking him clamly to talk and go trough it and talk to him u need good comincation in a relationship and unfortunatly i dont have that either right now.....
everything goes in cycles. maybe he is having a hard time at home or trouble somewhere else and it don't have anything to do with you. Just try to chill and not read way too much into things unles something comes up that makes it obvious he won't wanna spend too much time with you anymore. trying to read between the lines helps but sometimes it hurts. men are different creatures, sometimes when they don't show much affection all it means is that they are very tired or stressed out. it doesn't have to mean anything about YOU it may be all him. Hope things go well hon!
And if he still doesnt respond to you and you still get that feeling... you break up with him. If he puts up a fight... then he doesnt want to break up. If he agrees to it, then you guys are done and you broke up with him, not the other way around. If you cant salvage it, move on.
Sorry if that sounds crazy or something. I just dont like the idea of being dragged along for the ride.