There are definitely some red flags to pay attention to early in a relationship : They're controlling you: I mean by this that they are controlling the way you dress, the people you talk to, not accepting to give you your own space and even pressuring you towards unhealthy behaviors or beliefs. They're rude to other people: You certainly know a lot about a person based on how they treat other people, you mostly notice this behavior with people who might not meet their social class. They make you feel stupid : There are people who keep bragging about how much they know so they drive you to believing they have more knowledge than you do, we all have something that we master more than other people but it doesn't make any of us less smart. Overactive jealousy : Feeling jealous over your partner is normal, but sometimes it can pass the level of normal, It might be crossing your own boundaries, a relationship must be built on trust and obsessive jealousy is just another criteria of toxic personality traits. They talk a lot about their exes : Now we all get curious to know about the lives of our partners and what they had been through , but none of us want to hear about a certain person so much, if they're talking about them in a good way or even a bad way, talking about their ex so much is just another turn off and a big relationship red flag.