Hi and welcome,
What were the issue you thought you had gotten over that were standing between you?
Did you move ...or has she moved to be with you?
Looking at your bullet points why do this to yourself. Why be a fraction if you don't want that. Why wait to be fit in.
Time is finite. Did the other 2 guys agree to this as long as they didn't take a cut in time and attention?
Does she live with any or all of them? Do the other 2 guys have a set schedule...... Was and is there a set schedule now ?
I'd suggest reading as much as you can here and see what this truly means.