Should i be upset.

What would u do if u found out your husband is on a social/dating site. Although his profile says he is taken. Our relationship is not 100% more issues than a teenager but still. I feel he is trying to get other girls attention as he has a complex about girls not showing interest in him. Plus he has this girl in Facebook he constantly likes her stuff etc she works close to his job site they bot work away from home i cant help but think the worse we have allot of problems but should i confront him or keep an eye out to see how far he takes it.?