Why do guys talk to other women while in a relationship?

Pretty23
Every 6 months my bf talks to a different girl on Facebook for about a week.. He claims he's just bored an just wanted to see if he still has it.. We have been together for almost 5 years an we have two kids together.. I catch him every single time an i start packing my stuff an says he will stop that he loves me an wants to be with me blah blah blah... My question is why do guys talk to other women while in a relationship with the mother of their children?
Why do guys talk to other women while in a relationship?
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