The simple fact is that a multiracial marriage is like any other marriage. It will work if both of you in the relationship work on it. When problems arise, face them together and don't give up. You both have to work 100% for each other.
The main reason a non-abusive marriage fails is due to a lack of attachment to the spouse, whether it is not listening, not taking the relationship for granted, or infidelity.
If you cheated on the person you married, you never loved them, which means you should never have married.
Blaming ethnicity for one's problems is a sample. Marriage is a serious commitment and deserves the best that both of you can give.
As I said before. Marriage in a multiracial marriage is like any other; There are problems. And unless you're in an abusive relationship, throwing in the towel is the easiest way out.