How do you know when your ex still has feelings for you?
I believe you know when your ex still has feelings for you if they still try to communicate with you as if you are still together. Your ex can get in a jealous fit if he/she sees you with someone else if you have moved on. How he talks to you or tries to contact you too often is also another sign. If you break up, I believe it should be amicable, mutual and you should still highly respect each other.
you can tell if he treats you the way he treated you when they first had liked you, or if he keeps flirting with you and non-stop talking.