If you have trouble deciding whether it’s best to end the friendship, you may want to consult others since this is an important decision. Trusted family members are a good choice. If you decide to ask your friends for advice, make sure that they don’t have a relationship with the friend you’re thinking of breaking up with.
Avoid using accusatory sentences - such as “You have been a terrible influence” - as this will hurt your friend and may enrage them.
If you wish to talk to your friend in person before separating, you should add that at the end of your letter. It may be wise to meet with them one last time to bring things to a close and give your friend a chance to respond. You may also want to bring a trusted relative or friend with you in case things go wrong. However, if your friend has anger issues or you fear that they may harm you, it’s best to discourage any contact and refuse to see them.