If you are sure you do not like his annoying behavior, you should tell him and if you are really for the break up, then inform him and settle this issue. However, you can talk this between yourselves and tell him how you feel about it and get to find out if there is anything you can do to help.
if you are really sure that you both love each other then telling him his bad part won't be a problem,just make sure you do it the right time,i don't know if i have been able to help but i guess it will add to what others have said about it.
You kinda need to work through the annoying factor and try to stabilize it. That is of course if you see this as a good relationship. Maybe he is feeling something odd too right now so he is acting or rather over-acting and coming off as annoying. If you two can get past this point it will advance your relationship and the behavior should cease. Otherwise there the door.
Honesty, you're probably annoying to him too. You two should sit and talk and be honest with each other. Try to come to an agreement on what both of you should do. If he understands why you think he is annoying and willing to change, give him a chance. But you must be willing to change for him also if he requests it.
How is he annoying? Is he dorky (makes stupid jokes), different opinions than you, no fashion sense, chases women, what? Decide if his annoying habits and behavior are ACYUALLY a big deal, or if you are making them big by thinking of them. People are different. Allow him to be him. If he is too annoying for you, plan on leaving. But do NOT try to change him. He will feel attacked and it will drive him away. I speak from years of experience. Men hate that!!
Does he want to be poli grip? If so I know what you mean. I had a boyfriend like this in college. I finally had to set boundaries round the relationship. What I mean is we had days we did NOT see each other! If I wanted to go out with friends with him I did. He was a great guy...We broke up for other reasons....You do owe it to him to tell him what he is doing that gags you so much.