It is definitely possible to love someone and be sexually incompatible. What you describe is exactly how my 30 year marriage is. I ended up having an affair but have chosen to stay in my marriage. Even though he knows about the affair not much has changed in the bedroom. You need to figure out what your priorities are. I'm with him because I know I won't find a much better man than him and he truly loves me. He has just always had a much lower sex drive than me.