No technology is 100% safe, so there is always different ways to hack something, when we come to any social media platforms including insta, you can't hack them directly getting into their servers(99%) but instead you can hack them by tricking the person who uses them, for that there are different methods, like by guessing the password, using phishing, by using keylogging apps or softwares.... so for u i recommend u to use keylog apps(do google for how to use it) : Black hat Hacking is illegal, do it on ur own risk!