Relationship Trouble!

Me and my boyfriend just had sex and he literally lasted like..5 seconds. And when I told him that it was too quick he just shrugged and said "Yeah, I couldn't keep it". He's usually a lot more considerate but I don't know why he didn't care at all today.. Also we've been dating for 10 months now and he hasn't said anything about his feelings for me. I feel like I'm the only one pushing this relationship forward (not to say that he doesn't care. He is just really closed and isn't really allowing me to know how much he cares..). I don't know what to do because I really do love him but I

just don't know what to make out of everything. And this thing that happened (where he finished quick and didn't care to please me farther) is really worrying me. What do you think?