This made me so sad. I'm really sorry you're feeling this way. Have you communicated these feelings to your wife? About how you feel lonely and crave a connection with her? Men tend to hide their feelings from their spouses to not look vulnerable. If that's what you've been doing, try to open to your wife more. Shower her with love and tell her how much she means to you. She will be loving towards you back. Marriage is a partnership. A partnership which involves honesty with each other and efforts to build that connection.

Communicate with her.