$700 on a game

Ma
I just found out today that my husband has spent $700 on a game on his phone. When I confronted him about it we fought for about 7 minutes before he stormed off and left. We don't make very much money, and we have a baby on the way. I just don't understand why he would spend SO much and not even tell me. I've had a vacation with my parents planned for a year now and my husband said there was no way we could possible afford the $300 plane ticket. My parents (who also don't make a lot) have volunteered to pay for the entire trip for me. Now I'm upset, confused, and feel as though I have no right going on the vacation they are paying for knowing that we could have afforded it ourselves. Any words of advice?