Constructive ways of releasing anger?

husband and i seperated 2 weeks ago after i found out he was going to get set up on a date he phoned me this morning to ask if it was definatley over i said yeah then he said so we can see who we want now i was shoked because he was so blatant i said yes he said thats good thats all i wanted to know goodbye i was angry but i didnt let him know . off and on all day i have been fine then angry i just want to know if there is a constructive way to release this anger so i dont feel it any more i want to move on and not be affected by his bulls**t