Do you think i have lost him?

when the man you have been with for six years wants away from your controlling ways.Also this only happened since he started hanging out with his gay best mate. i could tell he wud be thinking of him even when he was with me.This gay has always been the third party in our relationship and there has always been a struggle between him and me.i wud follow them and they would be in pubs together now more often. when this guy was out of town my man wud be depressed till he got back. but i blame myself.we don't go out together, i am insecure and call him every 5 minutes. now he is backing off, won't meet up. insists i am a 'bunny' boiler and seems very angry with me.the more i call him the more he tells me to go away. what is happening, and how do i get him crawling back? i am so worried!