Which line below from act v, scene i, of twelfth night suggests that duke orsino considers olivia a heartless person?

duke: why should i not, had i the heart to do it.
like to the egyptian thief, at point of death,
kill what i love; a savage jealousy
that sometime savours nobly.—but hear me this:
since you to non-regardance cast my faith,
and that i partly know the instrument
that screws me from my true place in your favour,
live you the marble-breasted tyrant still;
but this your minion, whom i know you love,
and whom, by heaven i swear, i tender dearly,
him will i tear out of that cruel eye
where he sits crowned in his master's sprite.—
come, boy, with me; my thoughts are ripe in mischief:
i'll sacrifice the lamb that i do love,
to spite a raven's heart within a dove.