That why you be carefull with who you put yourself with and around!
Fuck! It’s not rocket science. You watch it, be a good judge of character, think about the big picture, learn to fuckng say no and distance yourself from those people immediately, early.
You dont even need to discard people, you immediately write them off and never see them again. Avoid them because if you don’t evwntually you will reach a point of no return, and then you’re fucked for life. That person is a permanant part of your life. That’s called baggage, good luck getting a ‘good one’ to put up with that.