why did my ex email my best friend? please answer i wanna know? im really hurt!?

[RiRi]

ok so me and my ex were in love.. im not sure if he loved me but im sure that i adored him! we ended it because his cousin came in between us and told him that i was cheating on him when in fact i was just a friend with him but i stopped being his friend since he asked me to sleep with him! i became his friend when my ex and i were not talking because of some fights. i didnt do anything with his cousin just close friends i told him about everything and how i love this guy! anyway the break up was in Feb 2012. i apologized and talked to him but he doesnt wanna listen. i see him everyday in university, he just stand and stare into my eyes a lot! sometimes the sad stare and sometimes the angry stare. my friend checked her university email so she saw that he emailed her 5 months ago. he said "hi,(her name) how are you? they dont know eachother but she knws that he is my ex and he knows that i am her very best friend because we ALWAYS hang out in university together! she just replied and said sorry i just checked my email, you need something? i was thinking earlier that just 2 months after he sent the email he followed my cousin on twitter and he doesnt know her, also he became close friends with my cousin in university like really close my guy cousin! can anyone tell me why is he doing all this the stare and trying to be friends with my relatives and my best friend if he doesnt want me?

[lisa]

Either trying to make you jealous, or he still likes you but wont tell you