It will make you heartbroken if your partner left you for someone else, and that's a given. You would vituperate to yourself, saying "he left me for another woman", or "she left me for another man", but all these don't really matter when the deed is done, and he or she is gone.

What you should think about is how to make your ex regret leaving you for someone else. There are two ways: a long method and a short method. For the long method, you should work on yourself, your career, and your physique in the first place, to a level that he or she would be envious, but this would take a long time, at least two to three years.

But most likely, you don't want to wait for that long and you want to prove to them that they made a mistake sooner than later. For this reason, I have made this guide that is going to show you what you should do to make your partner regret leaving you.

1. Don't contact your ex in any way

If you really want to make your ex regret leaving you, the first thing you should do is to cut off all contact completely. Don't be the crybaby and start calling them, trying to hear his or her voice for the last time. This is the first action that will make other actions work. Don't call, don't message, don't even view their status updates. You might even decide not to unfollow your ex, as you still want her to follow you and see your updates. However, you should also not react to your ex's updates and make them feel they are completely out of your world, that you are no longer dependent on them.

2. Take some exercise and become more attractive

Rather than whining and repeating that "my boyfriend left me for another girl", move on with your life and get your body in good shape. Who knows, he might have left you because he got attracted to a girl with a better stature. Work on yourself, and make yourself look sexier than ever. This also applies to men, if your girlfriend jilts you, you need to hit the gym if you have not been doing that, to get more muscles, and try to look better than you ever have.

To look more attractive, dress classier than you used to dress and you would be sure to spark some regret in him or her.

3. Change your life in a positive manner

It's true that your ex might have left you as a result of something about you that they do not like, or because they felt you are lacking something. As a person, there is a really high probability that you are aware of the reason why your ex left you.

Don't take it too bad and personally, rather take it as a warning sign that you need to up your game and change your life in a positive manner. Reflect on this reason, draw out a sketch of what you can do to change your situation, direct your energy away from brooding over the loss, nurture plans to get better, and become really good at what you lack. If it is a career, learn and get up the career ladder. If it's in terms of care, study how to care for a partner. Make a conscious effort at being a better person, for yourself, not for others.

4. Consciously make your ex jealous

What are the social media platforms there for? Make your ex feel the pain of losing you by having fun, and upload proof (pictures and video) on social media networks you have in common. Show off your travels, your meetings, and parties with new friends. This would tell him or her you are better than before when the two of you were together and it will keep you in his or her face. The stings will keep coming back. Also, when you coincidentally meet outside, don't let off a feeling that you noticed him or her, just walk right by. Simple.

5. Be careful of bitterness

Be careful, while you do these tricks, that you are not being bitter or trying to pick a fight with your ex. Keep it as light as possible, and a little dose of regret each day wouldn't be too much. Don't be so glaring about what you are trying to do, which might cause bitterness or conflict.

6. Do not acknowledge special days you once shared

One of the best ways on how to make your ex regret leaving you for someone else is to ignore the special days you both once shared. For example, on his or her birthday, don't acknowledge it by sending a message or calling them. Don't even update your own profile that might be termed by them that you remember. Just hold yourself back. Make sure to be invisible and under the radar and he or she is surely going to miss you on that day.

Finally

You and your ex started dating previously because you loved one another, and that love is real. Mistakes are bound to happen, which is why you separated, and you understand this. But pride is one big hindrance, and what can compel your ex to overcome that pride is regret. Hence, you need to go around how to make your ex regret leaving you for someone else. I hope that these tips can help you with this problem. Good luck!