What should i do?

Now i been marriage for 3 weeks now......and my hubby been actin really strange i do not leave together becuase his job his closer to where he leaves he stay with his mom who dont like me for what reason cause she dont know me but any who.ehen he gets off work sometime he turnes his phone off then he just up loading a picture to facebook witch he never had no up then he sent a friend request to a girl at his job witch i delete.he just not actin the same anymore any advice.