how people end up their life so easy?

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a month ago i read from the post in the facebook account of my friend that "again!there 's someone commit suicide in our beloved alma matter.a graduating student". in the latter part of their conversation there is a link that redirecting to that person who committed suicide and when i check it we have common friend. a very close friend of mine. then i ask him "is he your?", his answered is "yeah, we're very closed friend since primary school. i was so shock. "oh my! so sorry." he said, "yeah!i was so pitiful for him, he is the only son.he has no brother/sister" as our conversation goes on, i found out the reason why he commit suicide was because they broke up with his girlfriend. his girlfriend since secondary. after two days he was buried in the private lot of their family,we all know that the person who commit suicide is not being entered into the church but that was the first time i heard that it is not allowed to buried in the public cemetery. without doubt his girlfriend came to his burial. she did not even shame to came in that burial to fact that all the people in that place has anger feelings to her. she acts like she did not do anything wrong. how could she act like she's not even one of the reason why her ex-boyfriend was gone? how could that certain person end his life for that girl? how pitiful life he has.