How would u deal with this stage of a relationship😥

So about a week ago my BF and I had an argument and I decided to break up because the way I interpreted it. He then explained it to me and the fact that I completely had misinterpreted the whole thing. Anyways he didn't wnna break up and neither did I in a way it was almost enjoyable when he was saying "no babe we can't break up" "I can't say bye to u" "we spent to much time togather to just break it all in two minutes" so my dumbass Ofc dragged it too far to the point where he got fed up and just gave up and left. Realizing how hurt he was caz I promised him I wouldn't leave him ever until he cheats (he didn't cheat on my btw) and I left him over a argument. Now we go to the same Campus we see each other all the time therefore we r not used to ignoring each other it's almost impossible. So I looked at him and couldn't help but smile and he smiled back later in the hallway he pulled me into a stairwell and said how he misses me I thought everything will be fine. But in our texts his vibe was completely off. I felt bad so  asked him and he said he's hurt and it will take him now I feel sooo hurt I can't explain it because our relationship was the best thing I had I loved it. Now because of my mistake I feel like I lost him and his love even though he's still with me and is mine. I don't know how to get the old him back. I just want us to be the same as we were. The bond we had I want it all back