This one is something that has been a big load to deal with for me. It's like that few people I had a fine relationship with go into fight mode with me because they develop an inferiority complex issue. The first thing to accept is that those people have an inferiority complex! Next thing to do is to just not care whatever they do and let them know that. Just laugh away with the text messages you send them and tell them to have a nice life after telling them to not try make an assassination plot against you.
They will be like "What?" and "why do you keep talking about this?" It's just to throw them off, while having fun. Act this way with mainly guys and don't talk like that with girls. The girls are like a totally different planet you are on and the approach is entirely different.
For the girls, especially if you are a male, you have to treat them with the best manners you can give them. Using your common sense here, don't call her names that you think she's worthy of hearing. Don't justify what you did as wrong or show any hint of it. Be like, there's absolutely nothing wrong that happened unless you cheated on her then you are screwed! Besides doing something crazy like being a thief or killing her friend from dealing drugs, nothing so serious and she literally has an inferiority complex with you, just be like there's nothing wrong with yourself.
To show that there is nothing wrong with you with the girl, you have to lead her while talking to her using values. It's sort of like ethics, but the purpose is just to lead her in the right direction. You can state something like sometimes people go through struggles in life. To be a winner out of the struggle, it's an awesome thing to talk it through with the person you hate right now! Sometimes when a girl does something based on wanting to not talk about it, it sometimes becomes interesting for everyone to find out and by talking about it, she can hide all the bad stuff about herself that she knows and bring out all the good in herself and make the world a better place!
This is just from experience of how to deal with people who have an inferiority complex. I know they have it because I'm a man with a height of only 5' 3". I don't really think so much about how short I am now and keep forgetting to exercise in trying to make myself grow taller.