Rejected my best guy friend...don't know what to do to make it better

Well good luck to both of you. People don't just lose feelings for someone they like overnight. He's still going to like you, perhaps try to get your attention or he may be distant to avoid being too desperate. Either way, it's hard to see how things will be the same as they were before. See how things go, if things just keep getting out of hand then you should consider your friendship for your benefit

Either way, living together will be awkward. I don't think your reason was very good, especially since you kept thrusting your tongue down his throat and gave him mixed signals.

I was actually thinking this. Part of me feels like from what you've said, that you don't like him as much he likes you or you'd rather not have an awkward house than pursue something that could be great.

I think that's pretty silly if that's the case.

Yet, he ended up asking me to decide before we knew how the living situation was gonna pan out, and well I had to make the decision I thought was best in that moment.

Risk it for the biscuit imo

I think before you officially decide he's just your friend you need to see what happens once uni starts again. You've both expressed feelings for each other and that is going to be hard to pretend it didn't happen. But, again, if you ultimately want to just be friends don't get physically intimate with him.

You did make the right choice as far as I can tell I think

Hello, so I've never really done this before but I'm desperate for help.

In my group of friends at Uni there was this guy. Didn't think much of him for the first semester but when we returned from Winter break we got to know each other better and very quickly became very close friends. We started hanging out alone a lot. One drunken night we ended up kissing. We talked about it the day after and agreed everything was good between us and that it was "no big deal".
However, a week or so later he promised to take me to the train station at 5 AM so we stayed up all night together instead of sleeping. We watched movies and stuff but in the middle of it ended up kissing again. We laughed it off and claimed if we were both mature people it didn't have to affect our friendship just like he previous time hadn't. While I was away we talked every day and he told me he missed me and stuff. We promised we wouldn't do anything stupid because next year we were going to be flatmates and we didn't want to ruin anything (our friends were already hassling us about being too close and such).

However, as you all probably guessed, we didn't really stick to our word and stuff kept happening between us. He admitted to having feelings a few weeks before summer and I admitted to feeling something as well, but we promised we would go about summer normally, since we weren't together or anything and would be apart for 4 months. Yet, it was kind of evident that both of us were unsure of how the other would feel if either of us hooked up with someone else while we were away. We kept talking during the summer, cute words would be exchanged from time to time and we talked on the phone occasionally when we had something important to catch up on as well.

However, yesterday night while he was out drinking with his friends, he put me on the spot and texted me asking for a clear answer on whether we would be together when we came back in September or not. It was a very hard decision for me to make, especially because I hadn't expected to have to deal with the situation until September, but I had to tell him that due to the circumstances (living together during the upcoming academic year, and being in the same group of friends, and being such close friends) that we might be better off as friends.
He respected my decision but soon got very frustrated at me and my reasoning. He told me he finally realized the saying "nice guys finish last" was true and that he would need a couple days or so to "reconsider his perspective on things" and figure things out.
I understand that I have to give him his space and let him cool off. However, I am terrified that I have just lost my best friend and worried he won't want to live with me next year (we are staying with two other people in the flat as well).

Any thoughts on what I should do or what to expect of him are all appreciated..!!