To be annoyed at DP for spending his bonus on qualifications?

[LeonaStep]

DP and I work for the same company and both get an annual bonus.

We had discussed spending this years on a holiday - however he has decided he will spend the bulk of his on some professional qualifications as he is exploring a career change.

AIBU to feel a bit miffed? He isn’t set on this change but says the qualifications will help him if he proceeds. He’ll be spending c.£1700 and remaining bonus won’t allow us to go to where we had planned. Feels a lot of money to potentially waste?

If he is 'only' a partner not an actual husband, I would suggest all the more reason for the gentleman to have first say on how he spends his bonus.