Help!!

So my boyfriend and I have been together for a little over two years. I love him too pieces and can't imagine my life/future without him. Lately though I feel unlike myself in our relationship. The fire and passion isn't the same on my end as it once was. He's been very supportive and understanding but it hurts me because I feel that way towards another guy I work with. I would never cheat on my boyfriend.

It's just hard when I know that it's just me. I've tried everything to try to bring the fireworks back but it seems like I have to force myself to be in the mood because I can go so long whereas my boyfriend gets a little antsy and I don't want to make him wait. When I force myself it makes me kind of resent my boyfriend and my relationship because those feelings aren't there anymore and I don't know how to get them back.

My boyfriend is also the emotional one in the relationship and I'm scared to ask for a break because when I brought it up before and what he thought about them, he was visibly upset thinking I didn't love him anymore and a "break" between us means a "break up."

What should I do???