What should I do with our Marriage?

I am 27 and she is 24. We have been together for almost 10 years and been married for almost 5. We have had our ups and downs, but we pulled through them. We are fighting now, she wants to go hangout and have fun, but we have 2 girls of our own, a 4yr old and a 5month old. She has started to hangout with other guy she just meet and mentioned a divorce, because she is not happy. I told her we should talk about it and I mentioned counseling. She agreed to go to counseling, so we have not been able to go to counseling yet, what should I do? Since she heard something from her friend, mentioning that she would bring our babies around a druggie, she doesn't want to go to counseling now. Is there anything I can do to help her fall for me again? What should I do, I really love her and the girls enjoy us being together, please help.