boyfriend problems! help!!!

레슬리
My BF and I started as FWB, recently now I've been having a lot of thought that our relationship is purely based on sex.. Plus I've been talking about this with an old flame of mine who used to be friends with my BF as well and he keeps telling me that my BF is just using for my car for rides to work [we work together].. Sometimes I don't know why I'm even in this relationship ,don't get me wrong I like him but not like I used too... A lot of ppl have told me to break up with him but I can't I just can't break up with anyone.. As well as, I think I still have lingering feelings for my old flame but I'm not to sure of those feelings yet..... 
I need suggestions please..