It sounds as though he's going to keep his credit card at maximum, no matter what you do.
If he's not spending it on going out with you, then he is spending it on his gadgets, so you not going out with him is of absolutely no benefit at all.
If you have totally different approaches to money (which this sounds as though you have) you need to have a serious discussion about who is responsible and liable for what.
If you have already paid off his debts several times, then there is really no point in paying it off again.
This is the hard bit - you need to have a legally binding agreement that his debts will ALWAYS REMAIN HIS.
If you pool your money together, and have equal amounts of spending money then this is absolutely fair. It would be a post nuptial agreement and they are actually more legally binding than pre nuptial agreement.
It becomes tricky if you DON'T pool your money together, or you the two of you earn vastly different amounts of money - ie you earn twice what he earns but you contribute equally. As you've said you both earn about the same amount of money, this wouldn't be an issue, but would need to be born in mind if it were to change at any point.
That way his debt stops being your legal issue, and then you have the right to not interfere in how he manages his money. Until that point, you have every right in interfering, because it affects you.