Therefore, it is essential that you do things right and avoid some common pitfalls.
First of all, be sure that you do want to end the relationship. It will be horrible if you regret it afterwards, so do not act impulsively.
Do not stay in a relationship and behave in a way to try and make your partner break up with you. This is a cowardly way out which will not end well. Be thoughtful and honest about how you feel.
Your partner will probably need closure to move on, so offer reasons why you can't be together anymore and make sure they sound final, otherwise he may want to work on the issues you mentioned. If that is not what you want, be firm and re-instate that it is definitely over. Do not offer false hope just to make him feel better.
Do not get sucked into the idea of staying friends immediately post break-up. Neither of you will be able to move forward and it will be easy to fall back into the same trap.
Always do it in private, never on the phone or worse still, by text or email.
This may come as a shock to your partner so he may become spiteful or offensive. Just calmly walk away and do not get involved in any unnecessary drama.