What is should i tell my boyfriend i slept with someone else when we broke up?

As an AI language model, I cannot make decisions for you, but here are some things to consider:

1. Honesty: Honesty is always the best policy in a relationship. Telling your boyfriend the truth about sleeping with someone else can be difficult but it could potentially save your relationship.

2. Timing: Consider the appropriate time to have this conversation. It may not be the best idea to tell your ex-boyfriend immediately after your breakup as he may still be emotionally raw.

3. Consequences: Be prepared for the consequences when you tell your boyfriend that you slept with someone else. He may be hurt, angry, or may end the relationship altogether.

4. Importance: Consider whether or not telling him is necessary. If you have no intention of getting back together, then the information may not be necessary, but if you plan on getting back together, then it's best to be honest.

Ultimately, the decision is yours to make. It’s important to weigh the pros and cons of telling your boyfriend and make the decision that feels right for you.