Would be a heartbreak as bad as someone with a terminal illness?
Is it all just subjective?
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I'm afraid that my reasons are not valid enough..
It's subjective. That said the "popular" ranking of most to least legitimate is probably something like-
1. Terminal illness (Seen as reasonable by most)
2. For a cause, sacrifice for others (Can be seen as not only reasonable but honorable under select circumstances, but those are rare)
3. Impossible or nearly impossible to fix issues that severely decrease QoL like hard to treat pain, severe disability, etc. (A bit less reasonable; many will say you ought to push through.)
(Gap here. Most motives below this aren't acceptable to most people at all.)
4. Philosophical reasons (Could be seen as semi-reasonable if you seem mentally well but still thought of as very weird/deviant and potentially as evidence of mental illness.)
5. Semi-fixable issues that decrease QoL such as comparatively less severe disabilities and mental illnesses, poverty, treatable pain, loneliness, bullying, burdening others, trauma, etc (Mostly seen as unacceptable.)
6. Going through a difficult moment that most likely can be recovered from; breakups, death of a loved one you, a layoff, etc. (More or less universally seen as unacceptable.)
(Another gap here. I don't think even people on here would condone #7.)
7. Pure impulse due to some kind of mental condition.
edit: mind you this is just an estimate of how legitimate different "tiers" of suicide motivation are generally viewed. I personally only tick #4 and #5 (mostly #4) so I'm not in much position to criticize others' motives lol
That said you should probably consider if your motivation is really reason enough; one breakup seems like a bit much to CTB over. I had a friend attempt after a breakup and she's very glad she failed and is happily dating someone else now