못 + 가다 = 못 가다 = can't go ~하게 되다= become ~ ~하게 되었다/됐다= became ~ -->못 가게 되었다. became unable to go It means "(I thought I could go(come) but) I can't go(come)" <됐다=되었다> like <can't = cannot> I hope this will help you a little. Have a nice day~