The human heart is a strange thing, it's not easy.
I'm in a kinda similar situation. But no way near as severe as the OP.
I do love my gf, but i think that spark has just gone, and i am starting to think maybe we would be better going our separate ways. But she is just so nice to me, never does anything wrong, and devotes herself to me, so i have no reason whatsoever to finish her. The only thing is, she wants to be with me 24/7, which is kinda irritating. I have no real social life anymore as she has drove my friends away by being so possessive. If i go out with my friends without her, she sulks, or turns up! If i dont wanna see her for whatever reason, she moans. She checks up on me as well which is annoying beyond limits.
But she gets so upset when we argue and come to the brink, and i just feel so unbelievably guilty. I dont want to break her heart, but i also feel a bit trapped.
Damn, cant live with women, cant live without them.