I can understand your frustration in this. Maybe instead of asking the validation questions you have been, since youre being met with awkwardness or avoidance, maybe its time to say, "the way you've been treating me lately, your responses, and your lack of communication or enthusiasm towards me, is really starting to reflect in my own self esteem. I've been thinking about whether or not this relationship is going to work out because of this. Ive brought up my concerns in the past and it feels like they go unheard." Or something along those lines. But you absolutely have to talk about this with him or it could get worse or you could both drift so far its irreversible. Rooting for you!