My boyfriend of one year gave me a key to his apartment. Is our relationship headed to a more serious and committed level?
I think you know that it is headed there.. he trusts you, and is probably planning on being with you for a while :)~Ninja Jackie-san
It means he trusts you, likes/loves you, very comfortable. It can lead to commitment, or not. Some people never take the next step. Sounds like it's going good, enjoy it.
No he probably needs you to clean it!
Your relationship is definitely getting more serious. By giving you the key, he is hinting that he trusts you and also might possibly be hoping that you visit more because you have better access.
It just went to Another level he gave u a key!