Maybe he is going through some emotional issue or other stress himself. Give him the time to process his own issues. You can convey that you wish well for him and will be available if he wishes to share with you what's bothering him. Once you do this much, free yourself from this cycle of overthrowing about what's wrong and what have you done. As much we want, we cannot control other's responses. We need to find a space of inner peace and freedom for ourselves first and then out of that space reach out to others/ the people we care for.
Blurred boundaries may be confusing for both of you, avoid doing that. Be assertive, keep the doors open ( for a limited time) and if the person doesn't respond even after that, have the courage to walk off.
Next Steps
seek counselling for your emotional health
Health Tips
don't rush into making serious decisions. Breath, take control of yourself first.