Broken

My boyfriend and I broke up in March, however, he never stopped being in contact, trying to make it work from that moment on.  I needed time and space to see if he would make positive changes, and make them stick...and I did see some, enough for me to want to make it work again... we spent time togeter, we went away together, and I was ready to jump back in, however, now that I'm there, he's done a 360 and is pushing me away, being mean, and I am now feeling like we broke up all over again.  I feel so broken over it all, this was  a 4 year relationship, that at times was quite intense, both of our faults, and I see it now for what it was... I am sick to my stomach, I can't sleep, eat, and am barely functioning... this is by far the worst feeling and most intense I've ever felt afer any breakup...