I must say, God truly worked a miracle by intervening in your health. If He hadn’t stepped in, the stranger wouldn’t have given you such a huge amount of money, and the doctor wouldn’t have provided everything you were asked to buy. Such miracles are rare. Sometimes, we expect help from those close to us, but God can send assistance through someone we don’t even know.
As for your friend, what he did was wrong. How could he share your secrets with his friends to the point that they started making fun of you? That was really bad of him. What upset me the most was when he was telling you it wasn’t that deep and questioning why you were taking it so seriously. In my opinion, you trusted him with your secrets because you believed in him not because you didn't have family members to confide in, but because you chose him specifically that's why you told him your secrets.