It's usually this case...

Category A: If you love someone to the extent of changing yourself for your loved one, it most probably means this relationship ain't reciprocal. Your loved one isn't into you, that's why you're changing yourself just to keep him/her by your side.

Category B: If you love someone, but you still don't find the need to change yourself for your loved one, then it could probably means:

1. You are not really into your loved one. :D (maybe you're that "loved one" in category A. lol)
                         OR
2. Your loved one loves you more than you do that he/she does not see a need for you to change. In other words, you are perfect to him/her. (:
                         OR
3. Both of you are a perfect match! *I think I heard wedding bells~!*

I'm sure everyone wanna meet someone who falls under category B, cause it's really tiring to be in category A...