So difficult.

My fiancé & I have recently been arguing a lot lately and when I sit down and talk to him about how I feel and why I'm upset he makes fun of me, ignores me and just pushes everything aside or gets angry. 
I asked him why he does this and he says 'I just don't know what to say. I just don't know. I just can't think about things.'
It's really upsetting for me as I love him so much but he treats me like a best friend. 
What do I do? :/
I just want him to show his love & accept mine but he always tells me he doesn't know what feeling love means.