Lyric discussion by critch48 

Cover art for Crutch lyrics by Matchbox Twenty

I think he could be talking about a relationship where the physical element has taken over from the emotional element of their love. He feels like the emotional love is almost gone from the relationship, and all of a sudden it's all about sex.

And now he just feels like she's using him as a crutch, someone who she can get her dose of loving from.

On top of that, I really think Gabigs is definitely on the right track. I agree with your thoughts.