I'm not saying it should or shouldn't be a deal breaker, that's for you to decide but this:

it will be a deal breaker, I think.

is pretty wishy-washy don't you think?

What is it you want, Ruby? What is best for you?

Perhaps a long break from him would help you in the detachment dept. What I see right now is when he's not with GF and is friendly with you, you're up and when GF is back and he's paying attention to her, you're...not so up.

Who is in control of Ruby?

Me 57/H 58
M36 S 2.5yrs R 12/13

Let me give up the need to know why things happen as they do.
I will never know and constant wondering is constant suffering.
Caroline Myss