You simply stop crying, get up, go out with friends, enjoy yourself, and not worry about it. If they left your life they left it for a reason and you can't control that. Get some pictures on Instagram, show him what he/ she is missin, and keep doin you
Tbh we stopped snapping each other and that makes me sooo sad but when we did you were so hilerous on it and funny and shit, and your mad chill, really kind, and really pretty