... He doesn't know yet that I changed the locks...
You might want to proactively tell him about the locks or he'll just use the situation, because he'll be mad at you, as another justification for not wanting to be with you anymore.
Tell him the lock broke, you didn't feel safe, or something and so he'll need to make sure you are there before coming round. If he says he wants a copy, ask why he doesn't live here anymore and you want to strictly limit the number of copies to ensure you feel safe on your own. If he presses further, say "your personal safety is really important to you and you'll think about it".
- Nobody has ever learnt anything important from happiness and success; problems make us grow - Consult your plan, not your feelings - If you haven't set goals, how can you expect to achieve anything?
