Did you already encourage this partner to get professional help? Opening up to you could be a sign they're ready to admit they need help. School counselor maybe? Trusted relative if not cool with parents? Sbx mental help line? Just because someone (in this case your SM) is an authority figure doesn't necessarily mean they're equipped to help in a sensitive situation like this. It also might humiliate the partner to have their boss know.

It isn't fair for you to be burdened with this either though. Make a very strong case for them to get help themselves and maybe open the door for someone else to approach them. "I'm worried about so and so, they seem extra down, will you talk to them?" You haven't given away details yet (not all secrets are meant to keep though), and given them an opportunity to tell someone that isn't you.

Absolutely do not tell your SM. The partner came to you because they see you as more trustworthy than your manager despite being terrified of your SM finding out. I would encourage them to seek psychological help such as talking to a counselor at school or taking advantage of the Lyra benefit if they’re not already using it. (Or telling their parents if they feel comfortable but they probably don’t).

As someone who’s struggled with self harm in the past I remember being constantly on my guard to make sure that people outside of who I told didn’t have a clue. So just be patient and do your best. Remember that you can only do but so much to help them and to not blame yourself for anything.

Yes go to your SM. All you have to say is this person is having some trouble and that while you can’t confirm or deny that they’re self harming but you’re deeply concerned for their well being. I was in a similar situation when I was self harming and open enough to talk about it with a few of my partners and they told my SM they felt uncomfortable and that they were concerned about me. I haven’t done it since I just had a lapse in judgement. If you tell your SM they’ll most likely just pull this person aside and see what’s going on. If something isn’t right with any of your fellow partners you’re allowed to express that concern to your SM.

Please don't tell your SM. The partner told you because they trust you, and as someone who has a history of ideation and self harm, telling someone else can do more harm than good. Encourage them to speak to someone who CAN help, but don't tell anyone else.

That’s a tough spot to be in. I would encourage you to ask the partner to speak with someone (parent, doctor, manager, teacher) or even go to the hospital if necessary. Maybe if you feel comfortable offer to make a call with them.

There’s also the National hotline - 800-273-TALK (8255) or texting “Home” to 741741

The important thing is to put them in touch with someone who has the ability to help them and get them services.

I’m not sure they do it where you are, but the Starbucks here in New Zealand work with some kind of programme for mental health issues. Maybe look into it more and see if they can get help? I know someone who has done it once before🤔