I need advice

I met this guy on an app sometime last week, he's sweet and a breath of fresh air and he actually liked me for me (which never happens unless it's for sex) but a few days in and his best friend is texting me over kik, I was suspicious but one thing led to another (argument wise) is a group chat with the three of us. He's calling me names, telling me I have no business being with his best friend and how I'm no good and will cheat. This best friend of his throws out the fact that (let's call my guy J) has stage four cancer, as if that was supposed to scare me off. So J sticks up for me and we keep talking despite his best friend's actions, but ever since then, this best friend has been nothing but an utter ass to me. I've tried to be nice, and give him chances and ignore the fact that he has called me a bitch, slut, etc and try to build a friendship regardless but that didn't work and ended up in me finally standing up for myself. Everything exploded. After I have my argument with him, I'm texting J and this asshole best friend is texting him playing the victim, calling me psycho and whatever (as if I started the mess), so at this point I'm thinking he would do everything in his power to ruin things. Fast forward and K is talking to this friend at his house, he hasn't told me what happened and there's honestly no telling what lies have been said about me. This happened yesterday and I still gave It heard anything from him. I'm scared that everything that we had, had actually been destroyed. I really like this dude despite his illness, I was planning on going to see him, I'm really down for him. I don't know what to do... Should I give him space or continue to fight?