Please help!

First things first you have just gone from the initial I love you, can not get enough of you to the everything always the same problem. All relationships do this be them serious or not. As for what to do about it unless you tell him he might never know and so between you, you won't be able to change things so sit down and tell him how you feel it may well be he has been thinking exactly the same but also had no idea how to tell you. Then once you are both talking about it you can work out what you two can do to bring back the buzz and fun again. You may find something simple does it. Hope this helps good luck.

If you really don't feel right with him, break-up is probably inevitable, but take a few steps at first to find out why.
Think: Why isn't it the same? What happened? Did he change or did I? And decide if your relationship can be fixed or if breaking up is the best deal.
Don't bring it up to him unless you plan to break up. If you tell him that the relationship isn't fun anymore, he might try to change himself to keep you. If you plan to break up, tell him seriously, but assure him that you're still friends. Prove it by still talking to him and hanging with his crew for a while, unless he's annoyed by it. Chances are, he's feeling the same way- but is too scared to break it off.