He is not hopeless. He just needs to marry someone who feels like they can handle his issues. Like I said, I know someone who married someone on medication (someone whom I had thought could not get married) and they had a great marriage. I think that was because he knew what he was getting into and he felt that he was capable of handling it, which he was. She had a baby and did have a nervous breakdown for a few weeks afterwards, but it didn’t shter him. He had understood what he was getting into and he was able and willing to handle it.
I suspect that part of the reason he married her might be that on the one hand he had certain things that may have made shidduchim hard for him, but those were not things that she cared about, and on the other hand, he was extremely emotionallly healthy and a very happy, chilled-out person, so he was able to deal with her issues. So basically, they were a good balance for each other.
No one is perfect, and everyone has to marry someone with imperfections. You just have to make sure that they are imperfections that you can deal with (even taking into account that every marriage requires work and acceptance).