If you have to change your core beliefs in order to make a relationship work that's a sure sign that you've chosen the wrong mate for yourself!
The goal is to find someone who shares your same values, wants the same things for the relationship that you do, naturally agrees with you on how to obtain those things, and last but not least have a mutual depth of love and desire for one another.
Thankfully there are more than 7 Billion people on this planet!
Like attracts like and opposites attract divorce attorneys!:)