The low E, A and D strings are thick compared to the G and B strings! If these strings are still good, (only you can decide that by visual inspection) then I do believe changing them at this point in time just because the E string broke, is a waste of time and strings! For all you know, those good strings will give you many many hours, if not days, of playing!
That said, and having read all the opinions posted in response to your question, the decision is really up to you!
Lycaean