truth vs lies online

how is it possible to watch someone just fall apart all at once and not be able to do anything at all to stop it..i know that meeting people online and forming a relationship is not the same thing as meeting someone you work with and being friends that way..and meeting someone on a board about cutting/drugs/abuse/etc..whatever it may be adds on a completely different complex and makes it that much harder..and i know with online and all of that you kinda have to follow your gut and you know believe what you can..and just leave alone what you cant..but it just makes me question myself at times...i wonder if im that needy..if i have a major crisis every other day and just demand attention or support or something..and i know its pretty tricky to just call someone a liar on a board dealing with abuse but some things just make me tired..i dont like when someone is constantly saying they are leaving or they are going to just go and take pills and dont care and its like why are you doing this on a message board where people live all over the place..and its not like someone is able to stand there behind you and demand you take care of yourself or tells you to stop being so so i dont know..its just not ok ..and for a long as ive been talking to this person its like she has fallen apart pretty fast...gained a lot of issues that werent there before and i know there is truth in it..but somehow its not all truth and that makes me feel bad to just completely doubt someone and there motives..it makes me wonder if i do the same thing..do i demand someone is always there telling me that im ok and that they care and that they will miss me or something..and its just a lot to deal with..when i could just as easily make a choice to just stop associating/talking to them..because now i see their messages and it makes me tired..it makes me wonder why i bother or what they want this time..and that makes me feel horrible and shallow and rude and yea just a lot of stuff..and i dont even know why im worried about it so much