Major Friend issues...

Da

So I have these two friends. One is named Sarah and the other is Matthew. So I've talked to Sarah ever since 6th grade and I started talking to Matt like 8 days ago. Matt i would say is kind of bad. He's the type to get in trouble a lot , and talk to a lot of girls. He's been dropping a lot of hints that he likes me, but I don't know if I like him back. But anyways, tonight everything just went wrong. So me and Matt so far have FaceTimed every day we've been talking for 3 hours at the least. And Matt likes to joke around a lot. He's also the type who doesn't get attached. It makes me wonder if he actually has any sympathy for other people. So he direct messaged my friend Sarah on Instagram, just saying hey. It was a joke and we went over that when Sarah told me about it, I was supposed to be mad. So as soon as he texted her, Sarah told me. I acted all upset and kept ignoring her calls (this was all while I was on ft with Matt). But soon I realized that the joke was going way too far. I kept telling Matt I was going to tell her, and he kept calling me lame and stuff. I told her anyways, and she got extremely upset with me. She's so disappointed in me and I'm disappointed with myself. I feel like he's changed me as a person. But this isn't the only thing that happened. He told me his girl best friend doesn't like me, and I asked why. I really was confused as to why she didn't like me, so I kept asking. Long story short because I said her name again, Matt blocked me on Instagram. I asked him what it would take for him to unblock me, and he said if I said a cuss word. I'm not the person to cuss but I agreed to do it anyways. I said it and he still didn't unblock me. I know that the Matt thing is so stupid but I just feel a little heartbroken. Matt is the only guy to really talk to me, and make me actually feel pretty. I feel so alone that Sarah wont even talk to me. What would you do in my position?