Do you think love having a lot of financial problems is sustainable? I don't think so. And I didn't say huge money. I said the amount of money for which one needs to run a family.

I personally feel it's an important phase before every marriage because love wanes eventually and at that point in time, what sustains marriage becomes memories and children.

In my country, most marriages are engaged marriages, and in that case, I don't see anything wrong in the case of sustainability. Most of the marriage are sustained for a long time. It depends on the mentality of the person. Moreover, In the case of love, I don't think anyone should fall in love before the 22 as there is a high possibility of making the wrong decision and wrong person for love because of immaturity.
In the current time, Love also comes after seeing the wealth background. It should not be like that but it's the harsh reality. If you find true love then you will be lucky in that case.