h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

How?

No idea.

In that case it might be better to look at damage limitation.

Mills and Boon.

I am guessing that the question was rhetorical. There are different types of love. Love also has a time dependency, for example romantic love has different phases. So before one can attempt to answer how, one needs to know what (love). Love is more a feeling than a rationalisation, but love can be rationalised. The key is to differentiate love from a sense of duty, a sense of responsibility. One should be fair to both parties in the relationship, if one person loses themselves, loses their individuality, then that's not an enduring love, that's servitude (IMO).