Problem with my bf, Help? wont talk 2 me but the other nite talked & it was great but found out he was High!?

I hav a bf, we went out for 6 mos & then he wantd to take a break -we were disagreeing a lot, I felt like he didn't care about me & he said I didn't share my feelings, talk enuf & I was no fun to be with.- we broke up but got back 2gether about 3 wks l8r. we've now been going out for about a month. When he askd me back out he said he was wrong & stupid & he missed me so much & livin w/out me didn't even count as living. I, of course, melted. Lately tho he's been distant, moody & hardly speaks to me when I call. Evn when he calls me he's stil like that. A few days ago a girl he & I kno & goes to school w/ him askd me if we were goin back out, cuz she heard somethin like that, but no one was supposed 2 kno. That kinda bothrd me. Then she told me about a girl he askd out after he & I broke up. When she said no, he came bak 2 me. 2day my friend found out about, and told me that my bf told anothr grl at his school that he likd her. The other nite I tried 2 talk 2 him but he brushd me off.