The First Love

What to do when your old love is coming back after years, did you really move on from him or can be a friend to him or can you forgive him about the past? Or are you still have the feelings to him....
But you still remember the things he did to you in the past and that past still haunting you. When you finally can get up and move on he show up, that's triggers you back about the past.
You finally move on and be stronger, you are ready to take the next step of your slowly with someone new but he suddenly show up make you go back to the past. How are you going to deal with that triggers? Are you strong enough to fight back the bad past?.