1. He/She Talks Too Much About Exes
Talking about a previous romance is a normal thing. And it is sometimes necessary for your partner to give you a general idea about what his/her past is like, but too much reference to the past is a red flag. When your partner keeps telling you about the details of a past relationship, it’s highly possible that he or she is still living in the past and not truly devoted to the current relationship. What’s more, if your partner is still in touch with their exes, you might have to talk to him/her about his/her intentions.
2. Your Best Friends or Family Members Don't Like Him/Her
Opinions from close friends and family members enjoy two advantages: one, they are outsiders, who can offer you a more objective perspective in case you get blinded by love; two, they know you well, which means that they can recognize whether your partner could get along well with you. Being open to criticisms is not easy, but when they put forward suggestions, it seems wise to take some time to reconsider your relationship: is the guy the one for you, or does he or she have some serious weaknesses?
3. You Share Different Goals and Values
Alignment in terms of goals and value is of great importance to a relationship. They may include whether or not to have a baby, live in a big city or a small city, and how much sex counts in your relationship. Although being incompatible in these goals and values doesn't mean you don't fit each other, you should notice if you two have shown enough respect for each other’s values and whether you can accept this difference.