I'll speak from your girls' end. I actually only have straight guys as friends, it has nothing to do with attraction, i love women. I've been with my gf for almost four years and i swear she would be the last woman if we ended. Its nothing about being attracted to men, its just personality wise your girl may get along better. With me, i don't get alone with straight girls and lesbians seem to end up developing feelings. If she says she loves you, than she loves you. Questioning that will only jeopordize what could be. (: