you're right that i was automatically assuming she was a girl interested in a relationship. it is known girls can be just as sexually liberated as guys.
I disagree. Sometimes sex is what both parties are after, and the thrill of the chase keeps the sizzle in the air. Then when sex finally does happen, it can leave two people sitting there wondering, "what now?" If two people are young, usually girls want a relationship, and usually guys don't. It takes a lot of growing up to figure out how to make a relationship work, long after the spark of initial attraction is gone.
maddy, talk to your boyfriend about what he wants, and find out if you both want the same thing together. Without more info about your situation it's hard to say exactly what's going on, but so far it reminds me of my first boyfriend. Same thing happened - things went stale, but we stayed together for a year because we thought that's what we were supposed to do. It didn't work, because push come to shove, we had very little in common. It wasn't a relationship built for the long-term. When you're attracted to someone it's hard to see the situation for what it is because your body is screaming to take things to the next level - just keep that in mind, and good luck!
hope im wrong about this, but sometimes, sex is what some guys are after and when they get it, the relationship, the chase, the new adventurous side to everything is lost. it's caused by immaturity and lack of commitment/love
ask him to explain why things are the way you describe in your post. in the future, it's best not to engage in sex w/ boyfriends. most of them are just people passing through in life. good luck