The guy is different when in public and when he is just with you
If your partner is polite in public and disrespectful and rude when you are one on one, then you should pay attention to this bad sign – the guy has no sense of what is good and what is wrong so you have to talk to him first and if nothing changes, you’ll have to split.

The guy phones or visits you only when he needs something
Your man’s responsibility is to take care of you. His duty is to make your life more comfortable. But if he calls and visits you only when he needs it, then this is a sign that your partner is a bad guy.