Stuff to get use to

When Dylan was dropped off tonight, he yelled back to Gary "say hi to Jeanie for me".  I guess I have to get use this and make sure I don't force Dylan to chose between me and Gary / Jeanie.  Is it wrong to not want to be use to it?  I feel like I have a right to be mad and to hold a grudge.  Is it wrong to 'work' with Gary / Jeanie?  Am I showing them that I approve of Gary's actions by being cordial?  It takes a lot of energy to be so angry.  Vengeance is mine, says the Lord.  So, I have no right to hold grudges or to show Gary how wrong he was / is.  I think I can hold that line/boundary, for the sake of Dylan.  He knows what Gary did is wrong.  He is Dylan's dad.  Argh!  Life!