Sorry you are going thru this. idk what the reason or answer is maybe it's just a phase maybe something unrelated and he is just not comfortable talking about his feelings..maybe he is losing interest. idk could be anything. But I do know that it hurts when you feel someone pulling away or putting up defenses and it hurts when you feel your needs are not being met. but you can not control others behaviours, you can convey your own feelings, best if done in calm short manner, and also let them know what you is nessecary for you in a relationship and what you would like but are willing to compromise on...then ask what they think. You may or may not get the response you want but is the response you get something you can deal/work with? From there you can only decide what you are willing to do with what you are given...but if it is making you feel like bad...best to just walk away for time being. If he wants to continue the relationship then give it time and space, turn ur focus,elsewhere..see if he comes around sincerely. If not well...not everything is met to be and focus on other areas of ur life and eventually you will find happiness elsewhere. No one can say any absolute for you except you. And no one can tell you it's gonna be OK and you'll be fine, except whatever you decide to be OK and fine. Hope either way, you find some happiness and start to feel better