What would you do?

I won't make this long and drawn out.. but here goes... long story short. We've been together for 7 years and have kids together. We got into a fight and he went into a rebound relationship that he's trying to rub in my face. I went on my way and have just left him alone but I am devastated. He has also became distant and is so mad at me when I really didn't give him a reason to be, except not react when he bragged about her. All I done was try to remain calm and I tried to be supportive. I love him so I want him happy... even if it hurts me. What is the best way to handle this?
What would you do?
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