I am in need of serious help.

Ok, so to start off, someone that means the world to me and that I care about more than anyone or anything in my life, has recently been acting off, they stopped sharing how they're doing with me and started hiding their emotions, for more context they left a really toxic and emotionally abusive relationship a couple of months ago, and have been healing even since, it's been really hard on them and I've seen all the pain and suffering that healing causes, I've seen them paying a really heavy price of the toxic relationship and it genuinely breaks my heart, I try to stay with them and be there through the whole thing and I thought I was doing good, there we're times when they got better and felt like they're healthy and times when they got completely depressed and borderline suicidal.

In their previous relationship both my friend and the person they were with used to cut a lot, and used to cut together, it strikes so much anxiety in me just to think about it, but since my friend stopped talking to their ex and broke up my friend stopped doing it, even though they felt like doing it sometimes and when things got out of control I tried really hard to stop them and I had succeeded in stopping them.

they stopped texting their ex a month and a bit ago and it was through panic attacks and constant anxiety as to what their ex might do to themselves. Now 2 weeks ago I had found out through a reddit post that they had texted their ex again (after a month of not talking), relapsed in a sense. I was with them that day they acted fine (which is something they never used to do) so when I found out that it got bad enough for them to text their ex without me having a clue although I spent the day with them, it was rough for us, I tried really hard to be understanding, I hate how they hid their feelings when it got bad, that was two weeks ago or so, they haven't been the same since, yesterday I found out my friend cut, after months of stopping tgey cut again, and they're in daily contact with their ex ( my friend wants to stop talking to them they were emotionally abusive and they cuase them constant anxiety but they can't leave and don't know how to) I suspect that because they're talking to their ex, even though they barley talk and it's all formal and short, but the fact that they allowed their ex to talk to them and get back into their life is constantly draining and on their mind. When I found out they cut even though I literally spent the whole day with them and they acted fine, I pressed them so hard to make sure they're okay that day after a million "I'm okays" I got a "I'm a bit off", and that's it, I never expected them to be bad enough to cut, I replayed that day a thousand times in my head and I have been in constant anxiety ever since, I asked them when they cut exactly, when I was at the gym? When I was at uni? When I left for 5 mins? They said they're not gonna answer that question, I dont know what to do, I dont know how to help, I feel them pushing me away, and I fear them doing something bad, I genuinely care about this person and I just want them to be okay but idk what to do. What scares me most of all is the way they talk about it, "it kinda felt good after", "its the second day and I'm feeling better", they don't regret it and they don't see how bad it is and how cutting their body isn't and won't help with anything.

We thought about them going to therapy but that's literally impossible because of the place we live in, if anyone has any experience with this or has any suggestions as on what to do, it'd be really appreciated.

Tldr; how to help my friend and stop them from self harming.