i think the singer is basically saying he is with someone because he doesn't want to be lonely, but he doesn't really love them, he is just forcing himself to love them, so he can be with them.
it also says
"wishing I was loving like most of my friends oh I am so ashamed"
which might mean that he is also just pretending to love the person so hes not the only one of his friends who isnt in love?
i think the singer is basically saying he is with someone because he doesn't want to be lonely, but he doesn't really love them, he is just forcing himself to love them, so he can be with them.
it also says "wishing I was loving like most of my friends oh I am so ashamed" which might mean that he is also just pretending to love the person so hes not the only one of his friends who isnt in love?
i dont know really just guessing :)
but ive loved this song for ages x