First, you have every right to be feeling the way you do.

Second, try bringing it up when you're alone together, and be sure to avoid personal attacks. Let him know how much it would mean to you, and that it would show you how committed he is. Offer to help him come up with new designs to cover it, or offer your support in whichever way you see fit.

If he doesn't want to get rid of it or cover it up, then there is a much bigger conversation that needs to be had. If he says it's "not a big deal", be sure to stand up for yourself! It's totally a big deal.