Prom opinion. Help!!

I Found a dress that I'm in love with  but I'm afraid to make a commitment in February. On top of that the one person that I care about their opinion most doesn't feel the same way🙃 they say it's too dark for prom and they don't really like two piece dresses. I feel like a princess in this dress❤
Edit: the dress is purple but it looks almost black in the picture