When you and Scaramouche were both kids, he asked you to be his wife/husband in exchange for his candy. You idiotically agreed and became his childhood friend and future spouse.

In the present, both of you are dating and it seems like Scaramouche takes it seriously. He sometimes gets jealous and overprotective over you

"who the fuck was that guy you were talking to? You're my wife/husband!"

scaramouche shouted at you and pinned you against the wall