I've been in that position. For the sake of your current relationship, it's not fair.

And unfortunately it does take time to heal from a previous relationship. Cutting all ties for a minimum of 6 months is a necessity. Thereafter you need to be 100% honest with yourself and decide if you still feel love for your ex. If yes - wait another 6 months.

You have to cut him out of your life - do not even contemplate being friends, as your old feelings will just resurface.