What do i do?

So my boyfriend broke up with me a week ago saying that he cant handle a girlfriend (well a relationship) and school...he a junior so i guess that makes sense...i guess and well asked him..i said "So what, did you just fall out of love with me?" and he said "Im confused right now and im not sure i mean i guess that falls in that catagory." I was heart broken...im mean two days before we were fight about who loved eachother more....hah...and I just dont know what happened....he told me about a thousand times Its not you...its not you...but something still makes me feel like it was me! and he still wants to be friends...like we used to be...but we are just very awkward....i mean we have one class together and i can just feel his eyes on the back of my head! And I dont know what to do because i cant eat anymore....i can never finish meals...i just get nausous a few bites iin...my friends are all worried about me trying to give me food and stuff and freaking out but i mean i just dont know what to do!! and whenever i seen him i shake and my stomach like EXPLODES! When i go to sleep at night i cant get him out of my head! He was my first real love and I just felt like myself around him....Im broken and I dont know what to do...