Well who knows what will happen and will not. Regrets often come late. Realizing you missed half of your life for such a wonderful opportunity, you may then feel regretful or sad about it. But on the brighter side think that there are so many possibilities that could have happened. Some good, others may just be as bad as it could get. For example if such apartment was destroyed by the forces of nature or by some other reasons, would you then feel the same regret? Would you say "I missed the opportunity of my life?", certainly not. So the best thing about feeling regret is to not feel it at all and just let things be. Maybe you can find another instead of feeling like a loser because it will only add to your stress. cheer up there are so many good things in life to be happy about.