Fight the temptation to try to win this person back by continuing to talk and spend time together. If your ex doesnt love you anymore, then nothing you do or say will make him or her love you again. The best thing you can do for yourself is to keep your ex out of sight and out of mind.

How can I stop having feelings for my ex?

Some constructive, positive ways to release these emotions include getting some exercise, spending time with friends and family, volunteering (an excellent way to take you out of your own head), or being creative and expressing yourself through art, writing, or music.