What to do next?

Hi Ive been with my boyfriend for a year and since we got together everything has finally felt like its ok again. I had a bad relationship before and split from my childs father. My boyfriend has taken my son as his own and we were completely in love. All of a sudden he changed. When we had previously had disagreements it was just laughed off and forgotten about but a few months ago he started to shut me out at the first sign of an argument. I am currently waiting to see if we are still together. He disappeared after I was moody (not with him) the other day and has text me to say he loves me but wants to be on his own and doesnt know what he wants. In the past few weeks we havent had sex or anything because he's tired or watching tv. Were 22 and 27 years old! We are supposed to be buying a house together and if he loves me, how can he be so cold toward me knowing that i'm suffering. I practically begged him to come round, make up and forget it and just give me a cuddle. I was heartbroken and he just said no. And when I asked if we could talk on the phone he said no, i'm watching a tv program. How can he leave me to suffer. His mother told me that he says he feels the same about me. I just cant understand whats wrong with him and its killing me. I love him and he was the man of my dreams before he started this. I get attention from other men all the time and I just cant work out if he loves me why is he doing this to me and why cant he see that hes got someone special. Please help!