xxv.) rarely happens.

This reciprocation of hatred may also arise from the hatred, which follows an endeavour to injure the object of our hate (III.

xxxix.).

He therefore who conceives that he is hated by another will conceive his enemy as the cause of some evil or pain; thus he will be affected with pain or fear, accompanied by the idea of his enemy as cause; in other words, he will be affected with hatred towards his enemy, as I said above.
Corollary I .-- He who conceives, that one whom he loves hates him, will be a prey to conflicting hatred and love.

For, in so far as he conceives that he is an object of hatred, he is determined to hate his enemy in return.