No, you shouldn't. But you also need to tell your partner that you aren't really feeling the loving the way you need to. By just doing it to "do it", you are heading towards splitsville. You'll be filling less and less fulfilled and your man won't have any clue what the hell is going on.
You probably really need to figure out what in tarnation is sinking your battleship. Is it him or is something else going on preventing you from truly being sexually happy. These things are important. If you're not happy you might just end up pushing your booski away because we can tell when our women aren't satisfied. If your heart isn't in it, we can tell.
It's also possible that by talking to him, you both may be able to get that fire back. That's what you're missing and want, right? But you do need to be honest with yourself about what the issue is. If it's your man, and you know it, and there's nothing that's going to fix it, don't prolong it. Just speak up about it and decide what you need or want to do.
Wack sex is the worst...for everybody.