It sounds like there is two things going on here. One the bird loves you dearly and will do anything to get your attention.. That is not a bad thing, but he has developed a bond with you that is a a slight issue to him. As he feels your boyfriend is a threat to his "mate". That will take time for him to adjust to. Second he has the issue of screaming for any attention. Time outs help, if you stay in the room with him screaming, make a direct attempt to turn your back to him. That tells the brid you are annoyed with him and do not appreciate what he is doing. ( It is also tantamount to telling a slightly spoiled 5 year old "NO."...) Sometimes it may increase the attention seeking behavior... So just stick with it and with the time outs by covering him up. Eventually he will learn what behavior actually gets him the rewards he actually wants.
With the boyfriend that is alittle more difficult... Maybe have the boyfriend spend a little more time with him when you are not there. Have him change the food and water and even clean the cage, he needs to develop a bond with him also. ( Ok, I can see the boyfriend getting mad at me, LOL.. Sorry mate. :P). In time the bird will learn what his bond is, and hopefully wil develop a bond to both of you as his flock. Not just you as his mate.
