THis is from a man who is in his 20's but I do understand this because for awhile i think ive lost my sex drive but I did hook up with a girl tonight and was hard and everything ...

Guys dont lose their sex drive just randomly, something happens. It could be many things, but there is always a trigger. It could be hes scared about something, usually something about himself, impotence, sexual orientation (which i doubt) some fear he has, stress, etc. That could be that, maybe after 6 months he can be feeling scared to get close to you? It could be something in hsi relationship history, etc. Most women assume when this goes on a man suddenly has another gf or something ,but that Is raarely the case, men are beings of insecurity just as women are, and as we get older life is harder and harder... the best way is to talk to him but do NOT pressure him if hes not ready because it is absolutely scary for a guy to not be able to preform, ive never felt worse and ive had a crazy life.