Does he want to marry me or not

My bf of 3 years use to talk about marrying me and our wedding all the time.

But now he doesn’t like to. He changes the subject if I bring up anything about someone else getting married.

Idk if he decided he doesn’t want to marry me. Or if he is going to propose soon & he just doesn’t want to talk about it.

I know those are complete opposite theories lol.

We live together. Have been together for 3 years. He is 29 and I’m 28 yrs old.