I'm extremely confused. I'm in a very loving relationship but sometimes it seems very one sided. Let me explain...

My boyfriend, Drew, is very affectionate and is always there for me. We dated on and off for about 8 months and eventually slept together. Before we slept together, he was basicly the center of my universe. Afterwards... I just didn't feel the same. Not as strongly. I love him to death but somehow it just doesn't seem like he's what I want anymore. When I'm with him I feel content and pretty happy but when I'm away from him, like at work, I start having second thoughts. I don't really want to give him up since I've worked so hard on getting us to where we are now.

Recently, he's been bringing up marriage and kids and all that. Honestly, if this was brought up about a month or so ago, before we did anything, I'd be all for it and happy as a clam. But right now... it kinda makes me uncomfortable. Like I'm not ready for it when I used to be.

I'm not really sure what to do. part of me wants to break it off since the feelings are as strong as before and the other part of me doesn't want to give up what I worked so hard for.

What should I do?