Is he looking for someone else?

OK heres the story...my husband will get home from work and get on the internet and every time that i walk into the room he closed the internet window. I have caught him looking at quite a few times. Then yesterday I seen him looking at Yahoo Personals and Groups...what all goes on at Yahoo Groups? I also seen a e-mail to join a group...does that mean that he has talked to someone on there? I dont know what to think or what might be going on? Should I say something? Whould he be looking to cheat? Someone please help me...and no rude answers or you will be reported