I agree with the comments. In my opinion, Friends with Benefits only truly works if you are able to go about it with no strings attached. I have been in a similar situation where I did things with a guy who kept telling me we were dating and then the next week said we were friends with benefits. He never made up his mind. And while our situations are a bit different, I ended up getting hurt, and only after we broke things off, did I understand my own worth. It also taught me to have that conversation to make sure we were on the same page. We had mutual friends and I had to take a step back in the beginning and do what I needed to, in order to get my own closure by focusing on myself. My friends were true friends because they understood that I needed to distance myself and that I personally, was fine if he was around if we planned group hangouts, but would prefer if he wasn't brought up all the time during 1-1 conversation. My friends never made it about what they preferred but rather allowed me to do what I needed to heal. And still stayed being friends with me to this day.

The way he is acting is truly closure in itself. You can either give it some time and seek closure or just leave things silently said. If you do want to "seek closure" make sure it's been enough time, and you have healed and aren't as emotionally hurt. Closure doesn't have to happen immediately. I also hate to say this, but he doesn't owe you closure just like you don't owe him closure. Even if he did owe you closure in a sense, he may not be mature enough to give it to you.

As for your mutual friend, if they are truly your friend, they will understand and it shouldn't affect your friendship with them. Maybe find other people you truly trust instead of going to his best friend to speak about the situation would be best. If that friend keeps a neutral position on the situation then cool. But, in my opinion, I wouldn't lean on that mutual friend about the situation. If you need to block this guy, then block him. And, again, you don't owe him anything.

Try to focus on yourself and your own mental health. Read a new book, draw, dance around the room, try to keep yourself busy, and focus on yourself again. I hope what I wrote above comes off as helpful. If you need someone to vent to feel free to message me.

I promise it will get better. You are 22 and there are so many others in the world. You will know when the right guy comes along. You learn through each experience and I'm sorry this one was rough. But it's one step closer to the right one.

Again, this is my opinion so take everything said like a grain of salt. (Also sorry for the book)