For every 1 good one there are probably 10 duds. And there isn't any guarantee that the one good one will work out. So keep trying. And it depends on how soon you throw out your desires or demands and also how you say it.

That's a good way to find out the true nature of a person. How do they react when you really need them and ask them to sacrifice a little for you. The last guy failed with flying colors. Congrats that you found out now rather than any later and wasted more time with him. And if someone tells you they love you unsolicited, that is one thing. If they only say it after you say it, they often just don't want to hurt your feelings. I mean, in this day and age, what do they have to lose?