I think it depends on the individuals involved in the relationship. I think if one or both people in the relationship really want it to work, the disability will just be something they live with and overcome on an emotional level. But if one or both can’t see past the disability, then the relationship will suffer.
Even though I don’t consider myself disabled, I still think my UC could have ruined my relationship with my fiance if we had let it. Because he has resolved to stay with me though, I think it has only made us stronger.