what to do when the best friendship started to feel like a competion? just bad vibe, jealousy, self centered, imitating and possessiveness?

Open up a conversation. Tell them that you feel like there are weird vibes and you’re wondering if they’re okay. Be kind but set boundaries. If they respect you, they’ll understand. If they don’t, it’s probably a good idea to let them go. Protect your peace, nothing good will come of a friendship like this.