Devil may cry 5 Offer psn store parents on holiday have given 50 euro with but I should spend the more important things counts as a breach of trust?

Hey so I got from my parents 50 euro because they are on vacation and I fly a week behind her my mum told me exclusively that I should not get me a gamble from the game now I see the devil may cry 5 in the store is reduced from 70 to 35 euro what would you do? Get it and thereby break the trust or leave it and stay decent I do not know what to do I really want the game full

It would be a breach of trust. There are other ways to get to the game. Let it be better.