Is it right to date my ex's best friend? HELP!!?

I have this crush. On this AMAZING guy A. He’s funny, sweet, EXTREMELY cute and just fun to be around. But there’s a BIG problem. His best friend is my ex. And I broke up with him. So my ex (C) is taking it really hard. But it’s been almost 6 months since we broke up!! I thought he was over it until the street dance Saturday. It was 30 minutes into the dance when a slow song came on. I asked my friend J to dance with me. So he did. Then right after that another slow song came on. So I asked A to dance with me. We did. Then after that all of a sudden C stormed out of the place and Me and J chased after him but he didn’t want to talk. So after that I sent him a text saying what’s wrong he texted back nothing. I said something is. He didn’t reply so I went back into the dance and danced with more people. Then he came back in. I chased after him but he tried to run but he finally stopped. He looked so dead. I didn’t know what to do, what to say. He looked like he was about to cry. I told him to talk to me, tell me what was wrong. He didn’t tell me he just ignored me. So I said whenever you wanna actually talk I’ll be here. So I went back to dancing. He finally left and took J with him. So I wasn’t gonna let him ruin my night. I even told him the night before I was gonna dance a lot. So after they left me and A started dancing more. I liked him before the dance and as we were dancing I could feel the chemistry grow. It felt like we were dating or there was something there. I know there was. The way he kept looking at me and how he held me while we were dancing. I can’t even explain how real that was. It felt nice. Really nice. I know he had to feel something to. We kept dancing and dancing and dancing. We never stopped. It felt like a dream only it was real.Then the dance ended and I had to go and he was fixen to leave so we hugged goodnight and that hug seemed like it could’ve lasted a lifetime. I “think” he likes me too? Uhhh I don’t know. I don’t think he wants to hurt C since that is his best friend. I don’t know. All I know is something is there. I just don’t know how long it’s gonna take to admit it.