You just love each other, enjoy the sport and the other's success and realize that maybe one of you is simply better than the other at the moment, or has more talent generally. I feel that you gotta be honest with yourselves as to where you are and that things are just not evenly distributed, looks, money, talent, or ability in BBing. Accept it, work against it, for sure, but take it as it is at the moment.
I've learned one thing thru many relationships though: Jealousy and insecurity are not attractive. The more insecure a person is, the more their partner will begin to wonder if all the badmouthing they do about themselves is true.
It's all just Ego and it isn't real. That person loves you, so ya just gotta let it go.
It helps to not take one's self too seriously. It can take a while to learn this, but it makes life SOOOO much easier. Work hard of course, but realize that this game ends the same for everyone. Don't ruin all the times between now and the end with worry. And no one should make another person feel sorry for succeeding. Be happy with your improvements, and happy for their successes. JMO