That's sad to read.
Well, I played with the thought of having a mother placing someone else before me, and just the thought of it makes me sad.
And yeah, it is ok to feel like that.
But if I were your moms boyfriend, I would feel bad for you, you know, I don't think he want's to see you sad, and I don't think he want's to be in the spotlight all the time if it hurts you.
=)