Other forms: meddlesomely
A meddlesome person gets in your business in a way that's totally annoying. In other words, they meddle. Respect people's privacy by not being meddlesome.
In Yiddish, the word "yenta" is used for people who interfere in other people's business. A defining quality of the "yenta" is that they're meddlesome. You could say that someone who's meddlesome gets "in the middle" of your business, if that's the way you like to remember words. Just remember that the spelling is different from "middle." I don't mean to be meddlesome, but you'd be well advised not to confuse the words "meddle" and "middle," even if one helps you remember the other.