Thinking of reaching out to ex

I am married, have been for 3 years (dated for 6, engaged for 1) and have an almost 1 yo daughter. Our marriage has been a little rocky these days. In my early 20s I dated a man that was 7 years my senior. He knew what he wanted. He wanted marriage and a family. I was young and didn't want any of that in the near future. We dated off and on for about a year. This was over a decade ago. We have been in touch off and on throughout the years. The last time we were in contact with one another he brought up our past sex life. I stopped communicating with him. It wasn't appropriate. But, now with things so rocky between my husband and I, I have been thinking about him an awful lot. We see good together. Timing just never worked out for us. We haven't spoken in about 2 years. I feel the urge to reach out to him, but am afraid to. Since I'm in such a vulnerable state I don't want to do something I would regret.  My husband and I are in the process of seeking counseling, but in all honesty I'm doing all of this for our daughter. I feel like I'm in the marriage out of convenience. It ensures that I get to be with my daughter all the time and I don't have to deal with the hassle of filing for divorce and deal with all the aspects of divorce (court, splitting assets, etc). Please talk me out of contacting my ex. I am one of those that flows the mantra of "they are an ex for a reason". Advice?