1. He only uses you as a source of bragging rights.
Some men don't care who they date; they just want to show off their girlfriends to their friends. And if their partner happens to be a very attractive woman, they'll be even more smug. Beware of these men!
2. He values your money more.
Movies and TV dramas often feature a scene where the female protagonist complains, "I don't know if he's after me or my money." In real life, examples of men coveting women's money are not uncommon. Therefore, to be wary, avoiding excessive displays of wealth during courtship is a golden rule.
3. He only did it to make his ex jealous.
If he has just ended a relationship, you need to be wary of whether he is using you to "get revenge" on his ex. Signs include constantly bumping into his ex-girlfriend whenever you go out together, or him frequently taking you to places where he and his ex used to hang out.
4. You always take the initiative.
Are you always the one taking the initiative in this relationship? You take the initiative to ask him out, to ask him to introduce you to his friends... If he takes a passive attitude even when dating, your relationship has no future.