They simply do not doubt such things. That would be an impossibility for them. In fact, they are so hopeful that others think that they are not in touch with reality half of the time. Maybe those others are right but romantics don't care. They're having too much fun feeling hopeful while the rest of humanity gets depressed about things like failing marriages, getting dumped by lovers, and finding out that your mate is having an affair with the cocktail watiress at the Lone Star Bar.
Romantics are hopeful people.
You can't be hopeful and hopeless at the same time. The two words just don't go together. True romantics know that the joy is in the giving. Whenever I either hear someone roll out their list of expectations or include them in a dating site profile without sharing what they have to offer in return, I immediately know that they haven't got a clue as to what it is to be romantic. The truth is that they simply want to be on the receiving end without feeling any pressure whatsoever to reciprocate in like kind.