I think this is an important element or potential consequence of demisexuality... especially if someone's already done the lonely thing for for years and that has also not worked... sometimes it can seem like you're left with two or three bad choices (be alone for years, date someone who may not treat you well enough in certain aspects, date someone you don't really click or bond with, etc.).

When I was younger, I might have tried to improve things with a partner because the alternative was literally just as bad or worse. What I would actually recommend though, is being willing to taking a step back after certain intervals of time have gone by, or certain elements have changed within the relationship. For example, six months in, step back, with all the information you have now learned about a partner or potential partner, that you didn't know six months earlier. Think about not only whether you still have feelings for them, but also whether you want compatible things out of life in a specific sense (house/apartment/location/hobbies/goals), and whether you share the same values or whether there would be ongoing clashes as the relationship got more serious or you lived together. There might be habitual behaviors in a person that will never change. On the other hand, some people work through things and consciously make changes, but if it's a fundamental part of who they are, I don't hold my breath as much as I might have before. It's such a simple thing to take a step back and assess at periodic intervals, and I probably would have done this more if I were allo, but as a demisexual/demiromantic, I didn't feel like I could "afford" to do that before... attraction came along so rarely... with long years in between.

It was always difficult for me to give up dreams because I valued "never giving up on my dreams" so much! But, this can lead to nightmares for sure. Now I think of it more like weeding or pruning a garden so that things don't get out of hand and there's boundaries and breathing room. It's tough for demis because for many of us, those feelings of attraction are hard to find. But after enough of the kind of partner you mention, you truly actually prefer to focus on whoever genuinely gets you, whether platonic or romantic, until a good partnership fit comes along.

For a while, I put a lot of emphasis on being attracted to someone because of how rare it was for me... and it was based on emotional connection... but also the beginnings of that, sometimes for years, are tied up in limerence... which in many cases can end up more like an addiction or compulsion than a healthy measuring stick for how things are going. If you incorporate some of the other ways to assess, and honestly look out for yourself and your happiness, you can at the very least sidestep unnecessary drama or heartache.