Is there an easy way to tell who has deleted you as a friend by looking at your mafia list?

Hmm, I don't think so.

Unfortunately as things stand today, the only way you'll be able to tell that you're no longer friends is by getting the "you must be friends" message when trying to help with a job, or manually looking them up in your friends list. :/

If anyone has a different answer, feel free to leave it in the comments!