I won't let my bf touch me after having our baby

Destiny
I gave birth to a beautiful baby boy on March 31st. I love him to death! His dad is supportive and loving, but sometimes, when he touches me, I just start crying/feel nauseas and can't let him touch me. I will turn away from his kisses or cower from his hugs. He's never done anything to hurt me. We are both very confused and he's hurt, but trying to understand and be patient. Any tips or advice?