Surprise Divorce

I could really use some support and kind words right now. My best friend, my husband, (both 30) surprised me with divorce a week ago. We've had financial troubles, and some mental health/personal issues we are each in therapy for. I thought this was the work through and fight stage. Everywhere I looked said we just needed to find our relationship and connect with each other again. We've overcome so many other things together before, and we (i thought) were stronger together for it. But now he's met someone else much younger than us, at his new job, and he doesn't care to do counseling or anything of the sort. I'm so numb, and I don't know how to get over someone who's been in my life since I was 5. I have to give him what he wants, I dont want him to be unhappy, I just wish I could have been enough for him.