Search Results: normal to get jealous

its too long to put into story form so I'll put it in bullet points.
-broke up 4 months ago (I was dumped)
-immediately after that he kept trying to talk to me
-when I suggested we talk things out he started and we never actually talked he was agreeing with things I said while not coming to a resolution
-stares all the time
-gets jealous when I'm around other guys
-says he doesn't have feelings anymore (which would be cool if he was acting normal)
-I found out why he dumped me and tried to talk about it last month, but he got frustrated and sad
-I had to tell him something he needed to know and he promised if I did we'd talk... We didn't
-has been, according to mutual friends, depressed since our breakup, not doing well in his favorite subjects
-brother's girlfriend told me he's just hurt over other things and pushing away
-the other day I went up to my friend he was sitting by to talk to her, he looked everywhere but at me, my friend said his expression was sad when he got up and left
-last night was the prom we were supposed to go to and my friend said he'd been sad all day, most likely because he knew what day it was.
could he actually miss me? And why would he get frustrated if he didn't care?