<human>: I recently broke up with my boyfriend of a little less than three months because of distance issues. He and i did not have a strong base for our relationship because the day after we started going out, I went away for 3 weeks. I come back for 11 days and leave for college. He lives 6 hours away. I would only be able to see him on average 15 days per semester and not during breaks.
I was in love with him at one point but that feeling disappeared slowly as college life progressed. He loved me too but I feel it was more of an obsession and infatuation more and more. Our conversations began to only be about that we loved each other, but not why.
So I decided to break up with him (but do the "nice" thing and tell him I wanted to be friends, which was/is true).
He did not take this well. At all.
It's been two weeks and he has barely eaten. He has lost 19 pounds (he is around 6'2" and was already 145 pounds...). 
I have been speaking to him but I have had it and told him he is not my responsibility anymore and that he needs to see a doctor or a nutritionist in order to get his weight back on track and that until he is healthy, I cannot/should not speak to him or contact him in any way (let alone see him, which he is begging me to let him do).
His friends have been harassing me and are telling me I need to get back together with him or else he will not get better but I do not want to be unhappy again.
Reddit, am I doing the right thing by cutting off all ties until he is healthy, or should I be taking a more active approach into making sure he doesn't get truly sick? I care about him but I need to concentrate on my studies and stresses more. I don't exactly know how to not give a f**k but I'm trying. Does this make me a bad person?

Summarize the given text in a few sentences.
<bot>: My obsessive ex is starving himself I live 300 miles away and have decided to finally not do anything and concentrate on my studies. Is this the right thing to do?