True, the ending might not be what you wanted to happen but unfortunately, this is part and parcel of life. People let us down, promises are broken, things don’t turn out as expected, the rug is pulled under our feet.

However, your reaction to it all is... disproportionate. This suggests it does not come from a rational but an emotional place. A deep wound or at least trigger (coming from a younger place?) has been touched.

You don’t know what is best for them, sinking. No human being can know what is best for any other single person. This would be mere assumption, mind-reading or projection - not fact.

Finally, wanting to end your life because they did not reach out to you by email, seeing no point to life over it all... How can that be the best option for you?