Giving anyone "bad news" is always awkward.
This is especially true when you know it will hurt someone.
The person who is severing ties should take the time to decide when, where, & how while having their exit strategy already in place.
Life is always awkward when one flies by the seat of their pants.
The first thing you need to do is some serious introspective thinking as well as reflecting on the relationship in order to determine if you genuinely are ready to call it quits for good. Breaking up should be thought of as being just as serious as taking wedding vows. You don’t want to create a yo-yo relationship where you breakup one day and call to makeup the next day
On the actual day you plan to breakup with them make sure you have brought everything of theirs with you. Ideally you want to breakup at their place. This allows you to exit after you have said what needs to be said as oppose to trying to find a way to get them to leave your place. It is also safer for them to not have to drive right after you deliver news that is likely to upset them.
If you live together find you another place of your own or make arrangements in advance to have a place to go to after the conversation. Having to remain under the same roof after a breakup is living life on a high tension wire without a net.
Keep the conversation short and to the point. “I’ve given this a lot of thought and I have reached the conclusion that I need to end our relationship.” Expect to be asked (Why?) however keep in mind there is no answer you can give that will put a smile on their face or cause them to feel you are making the “right” decision. The only answer to the (why) question is, “I’m not happy being in this relationship and I understand you are not responsible for my happiness. That is completely up to me.”
Don’t get sucked into a “blame game” or heated argument. The goal of your soon to be ex is to get you to list “reasons” which they'll try to convince you they can change or address.
If you have sincerely made up your mind the relationship is over then it’s cruel to allow them to beg, plead, or lose their dignity.
Move On and Allow Them to Get Over You
Do not offer “instant friendship” as a consolation prize!
You are the last person who can help someone get over you!
Too often people offer friendship in an attempt to avoid being looked at as “the bad guy”. This tactic raises false hope for your ex that if they can win you back overtime.