Regarding your present relationship I['m sure you both have points, but it's not really working out for either of you so it may be time to consider breaking and moving on ? Just a thought.
He is very unlikely to go ending his life, everyone has to learn to take knocks, and in any case you can not limit your options because someone else might do something silly. If he opts to do something that is entirely his decision.
Do something about your exonerating relationship first, let the dust settle, then think about what is next.
If sounds to me as if a lot of dust needs to settle before you jump desperately from one relationship to potentially another. Let folk come top terms with whatever happens first, yourself included. Stay friends with those you wish to stay friends with.