Is it okay to tell your ex you still love them?

There are very few situations I can think of where this would be okay. If your ex has moved on with their life, or they broke up with you, then no. If you are still friends maybe it may be worth it to you to say something but you run the risk of ruining the friendship. You broke up, and you may still have feelings for them, but unless they bring up the topic and open a channel for you to say it then you should keep your feelings to yourself.