Can my boyfriend kick me out, change the lock and tell me that I can get my stuff when he is home?

You have not given us enough information. Were you just his guest then he can dis-invite you but probably should have given you enough time to take your things if they could easily be moved. If you were a tenant, he would have to follow the rules on unlawful detainer.

No, even if you were not on the lease. If you were living there as a primary home, he must give 3 days notice before he can begin eviction proceedings.