It is very normal to have feeling for the one u had in past
Explanation:
Few things that u can do if you have feelings for your ex mate is that :-
1. Mental Health - Let it not over power your mental ability that would affect your being and would show in your behavior.
2.Truth - It is considered as the biggest weapon. Without pondering over the repercussions it is advisable to share your thoughts and opinions transparently and truthful .
3.Let Go- One of the most important ability of humans is to let go what has happened in the past. It is always advisable to start fresh and stay positive.