Help! how do i get out of this relationship!?

i have a really emotionally abusive relationship.. and sometimes physicaly.. i dnt worry abt th physical side of things as i feel that its not as bad as how some get it.. bt i get really down and depressd abt other things. th guy im with makes me feel worthles. he has so mch pride and can never do wrong in his eyes. he blames me for alot of things tht happen and makes alot of rules, he tels me hu i can n cannot ociate with, im also not allowd 2 drink, he gets mad if he knows m on th net (he thinks i chat with other guys), i cant talk 2 ne guys, let alone say hi, (he actually hit me and strangled me bekoz i said hi 2 another guy from cl) and many many other rules. in fact, its hard 4 me 2 hav any friends at all. n of coz i cant make new ones because he wudnt kno them. i am really unhappy, not jus as th rules (m used 2 them) but lately he has been starting 2 neglect me. n i hav discovered tht he gives me more attention wen it comes2 . i ask him why hes so nyc when it comes 2 love makin n he jus says things 2 flatter me by sayin im irresistable etc. i kno it sounds like hes using me for bt hes not. he does pick me up wen i need a lift and take me out on special occasions, bt i jus cnt deal with th fact tht i dnt hav a social life anymore. i realy wana leav him bt its hard. ive decided tht i cnt stay with this guy. i jus wana kno how i can leav him. bekoz of his behaviour hes made me feel like i wil never find nebody els tht wil understand me like he did. he knows everything abt me n my parents like him. we wer also really gud friends for 3yrs b4 hookin up. we'v been 2gether 2yrs. i jus wana kno are breakups this ugly? coz everytime i break up i seriously cant cope. how do ppl deal with this?? iv never been thru a mve 1 b4. pls help me.