Boyfriend and I broke up but got back together

I'm 17 and my boyfriend is 20. We've been having problems in our relationship that dragged me down and caused my GPA to decrease by a whole point within the start of this semester because I was so worried about helping him. He's severely depressed and I would give him all of my happiness, but he wouldn't do anything with it so it would just vanish. It would take about a week for me to rebuild myself and when I did, I gave it straight to him. I broke up with him Tuesday night, because we mutually decided we wanted me to be happy and he didn't want to hold me back any longer. The thing is, the next day was supposed to be our 1 year anniversary. The only reason I broke up with him in the first place was because I asked the opinion of classmates and they told me if he doesn't make me happy, then I need to get rid of him. But the thing is, even though this boy drives me insane, nobody loves me like he does. Nobody makes me laugh like he does. And nobody is here for me like he is. Not only was he my boyfriend, he was my best friend. When we started dating, all of my other friends stopped hanging out with me because I had a boyfriend and they didn't. So yesterday during school was severely difficult and I had two classes where I just sat and cried. His ex passed me and GAVE ME A SMIRK. I was devastated. I looked forward to that day for a year, and when it came it was nothing how I expected it to be. I went out to eat with friends and they helped cheer me up. It was great. He texted me and asked if we could talk, so I told him he could come over to my house since nobody was home and we would. We did and we talked about what all we need to improve on, and decided that maybe we needed something like this to realize we need to get our acts together. I felt truly awful about having to break up with him right before our anniversary, but in the same way it benefited us in the end as he properly asked me to be his girlfriend again. I was happy. Tuesday and Wednesday I didn't eat anything because I was so sick to my stomach, but I knew that I needed to. When he was at my house and we were official again, I felt great. He asked me if I was hungry because he knew I hadn't eaten and he made me a pizza. Moral of the story: don't listen to what others have to say about your relationship; they may have been in a similar situation but everything varies, and everything is different. If it is hard for you to let the person go, that probably means you weren't supposed to in the first place. I felt like my heart was being ripped out of my chest that night and the following day. And I know we were only technically broken up for a day but it was a day of hell.