They use your new things, but when you confront them, they become angry. They disrespect you and your belongings. You may also notice borrowing become an issue. They borrow money and never pay you back. Borrow your clothes, property, and never give it. Return it damaged. Let other people use/wear your belongings. They may also ask for a favour but can never return a favour.
They may do this because they are jealous, if they want to teach you a lesson. You might notice that these people always need to know everything. For example, you may be talking to another friend about a secret and she/he wants to know what you're talking about. They often try to overhear conversations between you and other people. They often lie. They may lie their name, age etc from you. Be careful from them. They may soon blackmail or bully you. They may eat up your things. If they bully you never be shy to tell an elder. So try to dump this friend as soon as you find out that they are poisonous.
They may also do things such as drugs etc. and deny it. They might promise to call you back, but never do. Always keeps you waiting. Always make excuses as to why they didn't call you.
They can't include you to see a movie with their boyfriend/girlfriend. Spends lots of time with them, and when their other half is busy they want you all the time. They will ditch you for them if they come around.