I know what it's like to be in your situation. I've been faithful to God and to my wife for 8 years now despite her wanting out. She moved out (again) last year, but God has blessed me and I know that He will restore things in His time and has shown me that again and again.

If you need encouragement, look up Rejoice Marriage Ministries from Bob and Cheryl Steinkamp and read some of their stuff.