Where do I go from this?

So I had a conversation that I never would've thought I would have. Somewhere along the past 2 months, my relationship w/my bf has apparently become "boring." I could feel something was different about a month ago, but I was so busy with work & trying to adjust. I've tried to act really silly & have some fun around him the past 2 wks, because I knew something was off. He wasn't into it & ignored me. I was kind of shocked by it but sometimes I can't tell with him. So we have the conversation tonight as we're going home from a game. It took me to be in tears & asking what is going on & trying to guess for him to finally bring it all up. I don't know why none of this was addressed sooner; I know we are both to blame. We agreed that we want to make it better & want to work on it. I'm just trying to figure out what to do, because I've been trying for awhile. I mean if things aren't meant to be then they aren't meant to be, but I feel like I really want to be in this for the long haul. Neither of us are boring people at all, so I'm just trying to figure out how it became this way. If anyone has any advice, PLEASE send it my way....