What would you do?

My fiancé and I have been together 11 years. Lately he has slowly been putting a wall up between us. We rarely have sex, and he rarely has any physical contact with me. We have 6 kids together and I just feel lost. He even keeps a blanket or pillow between us at night when we sleep. Advice ladies?

Update ****************************

I should say our kids are his, hers, and ours. He had one he is 27 now, I had 2 that are 22 and 20, and together we have three that are 9, 8, and 6. But we do openly talk but he is a really closed person. Even with me he doesn’t talk about things that bother him much. He grew up in a rough home and his mom was abusive towards him. His entire family talks about nothing. And I mean nothing his mom has been going through cancer treatments and my boss (we work at the same office) knows more than my fiancé.

We have spent the last 3 days together all alone I had some training for my other job so I took the kids to my mom’s for a few days. He has opened a little and seems to be doing a little better.

Thank you ladies!!