Don't feel the same after miscarriage

I miss the old me I was happy and confident now I feel like I failed. my bf jokes and says he did his job just my body didn't do it's job I told him it hurts my feelings and he just says it's a joke. On top of it he was unsupportive didn't even really care I miscarried. He looks at other woman even. I just want to be alone and find my old self again.