Let me try and give simple definitions: "Bothered" - caused a bad feeling, like annoyance, anger, disturbance "Intervened" - did something that affects someone else's activities (can be helpful) "Interfered" - did something that disrupts someone else's activities (usually unwelcome) "Worried" (one meaning) - scared or caused a bad feeling like concern, or fear Your friend is in a fight. It worries (scares) you. So, you try to intervene (help). Your friend is bothered (annoyed) by it, so he tells you not to interfere (disrupt). Maybe that makes a little more sense?

I suggest www.thefreedictionary.com