Probably not a chance - look at it as an opportunity to start fresh and new. With or without depression - the affair might have happened. Most doctors use the depression an excuse fro an affair. An affair is an affair - depression or no depresion. Irregardless, there is still enough cognitive thought to know that an affair is wrong. Even though, he might blame it on you - he's manipulating you by using his depression. This happens in affairs and every other hurtful action committed by depressives. It's the worse disease in the world.

I hope you recover and find someone who can love you the way you deserved to be loved.