If you just mean someone you regularly have sex with, murders happen all the time.
If you mean someone who genuinely loves you, then it's much rarer, but still there have been mercy killings by lovers in cases of painful terminal disease, for example.
It depends on how you define lover.
If you just mean someone you regularly have sex with, murders happen all the time.
If you mean someone who genuinely loves you, then it's much rarer, but still there have been mercy killings by lovers in cases of painful terminal disease, for example.