haha.. i'd rather give up my gf, but i'd try to work to get to a compromise.. but there are many ways in which guitars are better than girls..
1) guitars wont be jealous if u keep 4 other guitars around the house..
2)guitars retain their curves over the years..
3) certain guitars actually go Up in value over the years..
4) guitars dont nag!!!
5) u can usually get a guitar to do what u want..
6) guitars have replaceable parts..
7) if ur guitar is giving u problems, u can unplug it, destring it and shut it up in a hardcase...
8) best of all, no need to buy contraceptives for ur guitar!!!
ok.. kidding, but in all seriousness, its really up to u.. mayb your gf doesn't understand that guitar is not just a hobby, but a way of life to u.. some things like this can't be explained, it can only be felt.. let ur music touch her heart and she may change her mind...