I'm not sure if this is the right subreddit to post this to, I'm nervous because I don't use Reddit much and I don't want anyone I know to find this. I'll try my best to cover all information and I'm willing to answer any respectable questions.
3 months ago, I made a casual online friend. We don't play much together because I have plans irl and have a part-time job but I have a fun time playing with them every time our play schedules match up. I don't expect much from a relationship like this one expect for light-hearted bantering and fun experiences. Until recently, they express to me how they're struggling mentally. They shared with me that they want to jump off a low story building, trying to calm me by saying how at worst, they would've gotten broken bones and nothing else. Hurting yourself intentionally is bad, no matter how small or big the injury is. Knowing that it only gets worse from here, I beg them to find help, professional or not and they said that they don't have anyone. They have a bad social life and I'm not sure about their parents but I'm willing to think that the parents aren't the best, to put lightly, and/or my friend is too scared to speak up for professional help.
I've never been put into this situation before. I'm 18 and I don't want to come off as bragging when I say I've have a better life than most. My parents are nothing but loving, I have supportive siblings and I love my girlfriend to the moon and back. My heart is on my sleeve and I'm more than willing to put my emotions out in the open for my loved ones. To know that someone I enjoy playing with and makes me laugh is struggling so hard mentally made me sob. I cried like a child and I made it known that I'll be in their corner, that they can come and talk to me if they need to.
I've consulted with my girlfriend and a few of my friends. My girlfriend is willing to be someone for me to lean on, if it evers gets too much for me. A small portion of my friends are saying not to get to attached and it's not my responsibility to shoulder someone's life entirely on my own. One friend stood out to me because they said they had similar experiences. How, at the age of 15 they had to beg grown men to not commit. But I see this situation differently, my mentally struggling friend is definitely younger than me, I'm in a good place in life, and I'm young. Of course I'll grieve over my friend if things go wrong, but life moves on and someday I'll will too.
I guess what I'm trying to say is, I don't know what I'm doing. Now, I'm turning to strangers on the internet for help. Can anyone give me advice on what to do?