Balance what is balance?. Is it a choice? If so a choice between what? To be alone missing your other half, but then you found it once who says you won't find it again? Or should the choice be us, but then us is more than you and him isn't it. It would be you, him and her. She was with him when you first seen him, again before you moved in together and is still with her now
I can't tell you what to chose for you but if I were in that position I would chose me.
Probably not quite what you were expecting as a review but it made me think. I always was one to think outside the lines.