I voted for the third option. It is not true in all cases that love requires money, but it can keep a relationship alive - for example, if a person loves money, then they can love someone because their money offers them the level of comfort which they much desire having. Personally I do not base my personal affections on money but I can see how it can be a factor.
For example, some relationships only start because someone has money which the other needs or desires. Some chances at great love are ruined by a lack of money, since one party cannot support the other or difficulties arise because of an imbalance in income.
Can money buy "real love"? I have no definite answer for this, but I think that it is perfectly possible for a couple brought together by fortune to stay together after the loss of that fortune, because while money may have brought them together, the development of their bond in other respects (learning how much they agree with each other, growing attached to the other person, etc.) during the rich years could prove great enough to allow for a lasting relationship.
Of course, a relationship cannot be a loving one if running on money alone. Personality, compatibility, personal sacrifices, etc. can all bolster a love which seems to have been forged by just funds.