Why my husband is so mean and cold when I need him?

My husband can't fall asleep at a decent time. Last night I went to bed at 12 and he said he was going to watch some more tv and come to bed. I wake up at 4 in the morning and he is still by the tv. Then I see that he had put the ac at 70 when he promised me he would put it on 73. He came to bed but I was really upset because he does this a lot. Then he went to the other side of the bed and said "I did not do anything wrong. I can't sleep and you cannot push me. This is why I like to work away so I can be away from you and arguements. It is 5 on the morning. I'm going out because I cannot sleep then I'll come back." I told him he was talking in anger and it wasn't true. I said if I thought he meant that we would seperate. He then said let's do that. It just hurts because all I wanted was some sympathy and understanding that I wish he slept in bed a little earlier and I wouldn't sleep alone most of the night. Also not lying about the ac when I specifically asked him. If he would of just hugged me it would have been all over. Then he wanted to sleep alone and I told hm to come to bed. He is sleeping but I'm judy sad of how he reacts to me. Shouldn't he be more sincere so stupid things wouldn't get so huge and hurtful?