You remind me of myself. I know how you feel when you feel that loneliness.
Although I'm not one to judge, here's what I have in mind for you:
Love is a commitment, an emotional, mental, and physical investment into another human being. You form a partnership, trudging through obstacles together as you both sojourn towards the end of your road of happiness together ultimately when you both part from this world.
Getting through obstacles and issues and working to solve problems together.
If either of you ever counted on the other, more than rarely, to do something or another, I guarantee neither of you would or could do it, simply because you just wouldn't, which would incidentally create problems, and you know the rest.
Think about what makes him happy too, but remember that you should never sacrifice yourself for anyone else completely.I know..nothing truly good can ever be attained or obtained without sacrifice, but make sure you don't sacrifice yourself, instead, sacrifice a bit of time or something that you do a lot and do it less or something like that. Don't sacrifice who are you, but instead compromise on the little things, the little things add up to big things in the grander view of this picture.