Dad won’t pay rent

So my fiancé and my dad had at it earlier and they put me in the middle of it so I quickly agreed with my dad that he doesn’t need to pay the $1100 he owes us back because I was put on the spot and wanted to leave as quickly as possible anyway my fiancé then said how I deceived him and I told him I got scared so he said that he thinks we need to go on a “relationship probation” and I was like “how about no” and then we agreed that I would tell dad without my fiance in the room that he needs to pay it back to us for school by December and he said he would but he then winked (as in he knows he won’t pay it by then) idk what to do