How do I move on?

I’m gonna leave my husband it’s seems he’s been unfaithful and I can’t forgive him. I’m so hurt my heart hurts we are best friends we do everything together. I feel I’ll be alone now besides my kids. I’m gonna miss our holding each other at night I’m gonna miss our weekends going out to eat . My life is going to flip upside down and I think i can’t do it. I want to cry every moment I feel out of breath. I can’t give up I have kids my youngest being only 9 months. But I’m not working he’s the sole breadwinner he isn’t denying me anything he’ll give my vehicles my house everything he knows how bad he messed up and he regrets it. But I can’t live with him and knowing what he did. Please what do I do how do I move on I feel my world is shattered.