Should I tell him?

Hey :) there is this guy, we have been talking for 2 months, he was sweet and all, but he suddenly changed. I asked him why, but he dont know ... he is now barelly talking to me, he is keeping his space, we used to tease eachother...Should i tell him, that he was making me happy, that theres good vibe when we are talking and what is now is making me sad?? I dont know 😓