It happens, try not to meet people that know both of you in order to avoid difficult questions. Try new things, go to the gym, do yoga, do sports, run everyday, take some poledancing classes or even TWERK. In conclusion try to do things that keeps your mind busy in order to no think about him, also dont date anyone for the moment, it will only cause pain for both of you. This is not the end of the world and as a man much older than you probably, everyone is replaceable such as you and your ex. You most probably find your match but give time to time and enjoy life at this moment in your life.