Do NOT hesitate –
Hesitation is a sign that you’re not confident to let go, once the other person sees you’re hesitant… breaking up will become very difficult, you’ll probably get apologies for whatever they have been accused for and you’re back into a relationship.
Practice the punch line
In fact practice the whole thing if you have to, just make sure when you’re coming out right that you be as clear as possible without over speaking and confusing your current boyfriend
Pick the correct moment
Obviously if you realize that he is currently going through hurdles in his life then that would not be the correct time as it will most likely come crashing down on you, if you feel you still need to dump him during this period then make sure you have a friend or 2 besides you if you feel you need to… otherwise being alone would be the best option as you don’t want to embarrass him in front of his friends/your friends by dumping him.
Explain your reasoning
As it says above, be clear and make sure you explain inside/out do not give him a chance to give interfere and make your reasoning carry less weight- you’ve made your choice and you’re not going back!