Emotions are always trying to tell us something. Is there a source of unhappiness in your relationship? Boredom? Believe me, every relationship has issues. I bet you felt the same excitement about your current boyfriend when you first met.
Unfortunately, when we feel attracted to another person, we begin to compare them to our partner. Of course, we know all our partners warts, so we are comparing apples and oranges.
Consider it fully before you end a real relationship for something you don't really know. If the relationship is important to you, consider counseling. It may help you recognize whether you really want to be committed or not.
Hope that helps,
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