How can I stop someone from hurting me when they don't care about my feelings?

Don't associate with then anymore. You already know they don't seem to care so why should u waste your energy in someone like that. At the end of the day you have to make the hardest decision in order to open more opportunities to meet new people. So the hardest decision being letting go of the person.

Build healthy boundaries around yourself. Learn to say 'No' politely in 19 different ways. Nasty people don't deserve how we feel.

Sometimes the best thing to do when somebody doesn't care about your feelings is to let them go and not let them be a part of your life anymore for your own good. That doesn't mean to be mean to them or not wave back at them if they see you somewhere, but don't give them the chance to hurt you.

Generally we can control our attitudes towards people but most of the times we don't get things back the same way. Sometimes we get hurt , intentionally or not, by people we care about. In that case, the first step to take would be to try Calmly and Smoothly raising the issue with them. Do not confront them at first as it can just get things worst and get them to be defensive. If after multiple trials, talking calmly does not improve the things. Consider your relationship with them again and answer to questions such as: How important are they in my life? parents, close friends, ... How would it affect my life if I did not have to deal them any longer? Ask yourself those kind of questions, and if you feel like you will feel better without them. Just explain them a last time how you feel about the situation and how you won't be able to support it any longer. Then just give yourself a break from them and hopefully if they care about you they will changer their behavior and otherwise, you will not have to be hurt any longer.

I would just sort of review if it is worth it to let that person keep doing it. Is it really worth my happiness? Do I really want to continue to live in pain just to keep from losing that person? My answers would be no. Because I want to be happy and not be in pain. And if they get upset, then oh well. They can deal with it. But I want to be happy and my happiness is worth more than my distress. And I would pick happiness over that someone every time.

Distancing yourself from them and cutting ties may be the best course of action here. If they don't care about your feelings, then will continue to hurt you as long as you are around them.

You don't need such a person in your life. Eventually you'll learn that, in the end they're not worth it. So leave them. Chin up, be brave, be strong, and stand up for yourself. You can only live peacefully and happily with someone who respects you.

You can't stop people, exactly. But you can change the way you receive it and then way they deal it.

If possible, stop being around them / block them on whatsapp etc.. Being around people that don't care about your feelings and hurt you doesn't do you any good.

A person who genuinely does not care for your feelings either misunderstands them and can be persuaded to understand, or they are potentially toxic to your well-being. Communication is key. If you feel safe enough, start the conversation. If their response isn't what you need, consider moving on from this relationship for your own emotional health.