My husband suddenly changes his dressing, outer look and talk to phone very softly.?

My husband suddenly changes his dressing style, outer look and talk to phone very softly. (When I entered the room he will quickly hanged up his phone). Sometimes, when i entered our room his quickly switch the web to his office work.Nowsdays, he will go to Pub with friends until 3 or 4 am (his seldom went to Pub for 12 yrs after we married).He even changed his credit cards bill address to his office address and hide some of his personal things somewhere else. He even afraid that i search his things. When i queried him, he will just keep quiet.(Normally he will talk back and talk loudly to me). That is one midnight, one of the girl sent messages to him, he quickly delete away and said that somebody sent wrongly to him. Sometimes, when he alight me and my son at downstair, he will park his car at the car park. He took most than half an hour to park his car.(For parking,it will took less than 5 min)That is one time,i saw him talking to his phone.Is this going to tell me that he has womam