Yes. The truly loving choice is sometimes not to be with the person you love.
This isn't empty moralizing. I know this from both sides.
I loved someone who died by suicide. he left words absolving me, saying how much he cared. It didn't matter. For months, I drowned in guilt.
And now on the other side: as a suicidal person. And because of that, I hope my absence goes unnoticed by those who might care. My suffering ends. Theirs, if they notice I'm gone, would just begin,a sentence they'd have to live with for who knows how long.
I should point out that there is a psychological phenomenon called "survivor's guilt," where people who were too close to suicidal individuals developed depression and some even killed themselves later.