So me and my best friend have been in a relationship for the past 4 years and we've basically grown up together. I've realized that from the time we first got into the relationship I have had absolutely no emotional attachment or need for her, it's purely physical to me but I'm not even that interested in the physical aspects of it. She always tells me she loves and wants to be with me for the rest of her life, but I really don't want that and I've told her that. I'm not sure why I even got with her in the first place.

We get boyfriends every now and then when we get interested, which is what I think is odd since I'm perfectly ok with that and it's pretty easy considering we're not open about our 'relationship'. So am I bi or am I just doing this for the hell of it?