Spending money

My fiancé knows we're trying to save so we can move out together and he promised me he will save money but he just bought a new iPhone and got a free otter box but he also got a tablet and bout an 80$ otter box for that and didn't tell me until after and now today he went out to the store with his sister and bought a 95$ life proof case for his phone and he buys expensive (45-120) dollar knives and flashlights all the time I'm really upset but I don't wanna start an argument I'm saving all my money and he's spending all his even after he promised he would save so we can live together