Coming out while in a hetero relationship?

Ok.  So I realized my bisexuality/pseudolesbianism/gee pretty girls make me tinglyness while in a longterm heterosexual relationship.  I've been struggling with the idea of coming out-is it necesary to do so while in a monogamous heteroship?  Maybe necessary isn't the right word.  I just feel conflicted on the whole thing.  Any opinions?