What are the best song lyrics to express regret and say sorry?

I'm looking for some funny, sad, poignant or all of the above.

To cut a long story short: Fell in love with a friend whilst in long term relationship. Stayed with partner, cut contact with friend, its been several months and I want that friend back and want to say sorry for the way I treated them and express that our friendship still means the world to me.

But not overplayed chart songs where possible. Thanks in advance for your ideas.

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).