Am i doing the right thing? And what happens next?

soo i've noticed a change in him, being less interested in having conversations and stuff. we haven't done anything together in a few days. so, i've decided that i'm not going to text him, just give him space and let him text mem because i'm usually the one that texts him first. but, what should i do if he doesn't ever text me or try to get ahold of me? should i just let it be or try to talk to him? we're not officially boyfriend/girlfriend.. we're just "together" & have been for about a month... what you think? thanks for your help!