I think in a healthy relationship both partners put the other person before themselves. Neither partner should ever feel like they are putting in more effort then the other or that their wants and needs take the backseat more often than the other. It's a two way street.
When doing mutual things, doing everything my way got to be boring - I can do all that when alone more interesting and adventuresome to do things the other party's way and learn what other things I might like better
the happiest are ones that delve into other's lives more than their own
I put my well being and success before pretty much everyone except my mom because I spent almost all of my childhood in hospitals being treated for several different life threatening problems and she was always there with me
Middle ground. Primarily, you should care for yourself FIRST and foremost, but if it's a situation where someone you love is going to suffer more from an action than you are, then help take care of THEM.