Should a daughter be happy for her dad's new family?

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I wish my dad chose to mend things up with my mom - us, than getting himself a younger woman to remarry with! I thought I'll have a guy like my dad... I thought I'll walk in the isle someday with him as my escort... I thought the separation was the most painful thing for the whole family but I am mistaken - hearing the woman from the other phoneline saying "yes I will marry your dad" has stabbed my heart deep. There's no hope then to reunite... the little hope that is left is now beyond reach - it's over now! I just couldn't get through the feeling of being dumped and replaced! Especially by the person whom you have known since childhood. Yeah, he's not the best dad nor a better dad but he's still my dad. And I thought he loved us enough to come back and correct things and try to change... but he didn't and he would not. He has life and needs as well, yes I know that perfectly. He needs to attend to himself and be happy. If this what makes him happy okay... but I wish am truly happy for him. Am I being a bad daughter for keeping ill feelings over my dad's remarrying? Should I be happy for his new family?