What should I do when my boyfriend is distance?

My boyfriend and I have been on an on-and-off relationship and I think this is our sixth time getting back together. I really do love him and all, but for some reason he seems more distance. Like usually when he says hi, he would hug me and I would hug him back. and when he says he needs to go, he would tell me he loves me and kiss me on the lips or cheek. But now he stoped all of those things. I don’t know what I did wrong. and I’m scared that he’s falling for someone else even though he told me he only loves me. so I’m really confused, I don’t know what to do.

Plus when I text or talk to him on MSN, he replys back 10-30 minutes later! I either think he’s ignoring me or doing other things and I don’t really like being ignored. sooo PLEASE HELP ME! thanks (: