Hello @lil-lily06,
I may be wrong, but in my opinion people who give the silent treatment either don’t know what to say or have things to say but just don’t know how to express them (and thus they withdraw from the situation and take time to think) or they just don’t care. Since he asked you if you wanted to stay for a month and possibly live where he is in the future, I am assuming that your answer (“yes, BUT I have priorities”) wasn’t exactly what he was expecting. He may not know how to respond to you and may be thinking of the best way to approach the situation. In that case it is very mature and respectful of him, and I would just give him space and time to think.