I'll change anything and everything to make you happy
Why would you change anything and everything to make me happy?
I will do anything for you...I want to make you happy
It's nice that you want to make me happy! You really shouldn't go to such great lengths as to change everything in your life just to make one person happy though. People will probably start taking advantage of your kindness.
But I love you so much.
I appreciate your effort for me. You also need to remember to take care of yourself, you could burn out eventually.