Struggles...

Hi I don't know if I'm going to describe this well but I'll try. I've been with my partner for 6 years. He's the sweetest man I've ever meet. We were also best friends for 5 years before becoming a couple. We aren't sure if he has autism as he often struggles to understand social Q's, he struggles to put himself in my shoes in particular, becomes easily distressed and won't meet friends or family of mine par two people. I've noticed he's struggling more now than in the past to talk about life and is finding sound very distressing. He also isn't affectionate as he once was. I often feel alone. I guess I'm posting this to a not feel alone and b to see if anyone has advice for me as I feel more lost than ever.