Should I get separated?

I have been married for 7 years and have a 6 year old girl and 4 year old son. My wife and I seem to argue constantly and there is no inimacy in our relationship. I am 38 and my wife is 43 and I have been sleeping on the couch for at least the past 4-5 years. We have had maybe 5 times in the past 5 years and I have no desire for her. She shows no interest to be with me and I have to initiate anything ual and I am very resentful, We live like roomates and I want more. I am in good physical shape and other woman are attracted to me but I have done nothing because I love my children and it would crush my family and hers if we separated. Neither of is happy but we are both afraid to leave, I am sure of it, We have both had a tough past 6 years as we both started teaching when my daughter was born and we both have had to take alot of work home with us and thus it seems we lost each other. My wife has now gained weight and I find myself no longer attracted to her and am sick of fighting and am worried how this will affect our kids. What do we do? We tried counselling briefly but it got us no where. We went on a vacation together and she had her period those days.This sucks