Remnants of the past...

I currently live in the house I bought with my ex in 2008. We were never married and broke up almost two years after we closed escrow. I love my house but unfortunately, I know I'm going to have to sell it. My ex is currently living with his friends but eventually, he will need to get his own place to accommodate himself and our daughter. He can't do that with an active mortgage on his credit report. Unfortunately, I also am unable to get his name removed from the mortgage without resubmitting a credit application and coming up with an extra $84,000 to make up for the difference between the current mortgage amount of $245,000 and the actual value of the house of $161,000. There is no reasonable logic to pay half the value of my house to get the mortgage in my name. I'm going to stay here as long as I can but it's also very sad that I know I won't be able to stay even if I wanted to. Unfortunately, even the loan modifications out there cannot help me.