Hi,
Sorry to hear about your situation, it must be difficult, but every marriage faces difficulties at some point.
I commend you for not considering divorce an option, you owner yourself and your commitment to sacred vows with Guru Ji.
Ask him why does he seek attention from other girls? Is their something he needs that you can fulfill.
Children can be emotionally and physically draining, you should both take some time out for yourselves once a week. Leave the children with their grandparents and go cinema or bowling.
Communicate with him from a loving perspective, let him know how you feel for him.
Hope that helps.