Is this bullshit?

You can ignore

In short - "Falling in love is easy but sustaining it is difficult, you need to work and spend your time and effort to continue this Love. If not things like break-ups, Extra-marital issues will happen"

Don't think so, I fully believe that we need to spend our effort while in Love. Of course there are cases where-in even after a lot of efforts, the person might leave you.