My bf and I were frugal-ish when we met, but together we have improved by leaps and bounds!
-We don't stress/fight about money anymore. Now we just excitedly "play the game": hunt down the best deals, try to outthink our way out of financial traps, and all around try to be more frugal. And it's fun!
-Gift-giving occasions are no longer a source of resentment. Should they have been? No. But if one person goes overboard (ahem... Moi) then it's easy to feel sad if the other person "only" gives you a book. Now I appreciate the fact that my bf doesn't go crazy on gifts, and anything he gives me has added significance because I know we have a tight budget.
-Sex is free.
-We plan for our future. We will be able to spend more time with our future children.
-We cook at home more, which is more meaningful to me than eating out. I think that cooking for someone else can be an act of love, and eating out 3+ times a week can be an act of laziness.
Has Mustachianism improved your relationship? How? :D