No need to ignore him as that would only make things more awkward for you and the people around you, so at least don’t ignore him purposefully. Your case is actually one of the few cases where the “no contact” rule is an exception…but DON’T initiate random contact in any way and don’t make any unnecessary chitchats, all right?I’ve discussed it in these videos, as well as how to handle it: When Is It Bad To Ignore Your Ex? Exceptions To The ‘No Contact’ Rule and How To Act Around Your Ex (6 Tips For Handling Post-Breakup Encounters). The decision on whether you should get him back or not is completely up to you, though. All the best!