It sucks that I'm really having a hard time restraining myself from explaining to a guy, who's been a parent for almost 8 years, how to be a dad.
You only get to see your kids for 48 hours during the week and you squander it on Valentines Weekend* date night, going to a basketball game, and dumping them off at Sunday school.
The reason your kids call you every night is because they miss you. They want to be with you, not the kids at Sunday School, not their aunt, not your incompetent fiance, you.
Grow up. Become a man. Become a dad. Spend those few, precious hours of the week with your children. Take them to the basketball game, plan date night on Thursday night instead or maybe on actual Valentines day when you don't have the kids, spend the last hours outside, playing, skiing, walking, doing something for God's sake. Don't waste another weekend. Your kids love you and miss you. Right now, you're showing them how much you love and miss them. And right now, they're learning that they love and miss you a helluva lot more than you love and miss them.
*Valentines Weekend? Seriously? It has to extend to a whole stupid weekend now?