How well do you relate with your ex?

My ex that is my kid's Dad and I have finally been able to become friendly with each other. Maybe it is because we are both in good marriages now. He andI basically grew up together. From 20 y/o to nearly 40. We also have 2 kids together and must maintain some sense of cordiality for their sakes even though they are adults now. I'll admit there are a few rare times when I feel I've never really quit loving him. But can you ever really quit loving someone you loved with every ounce of your being? I'm happy in my current marriage, but often find my mind wandering to when it was really good with my ex and I even sometimes compare those good times with the good times I have with my current husband. What gets me through those times is I don't believe in ever taking backwards steps and I know that even though he has again become a nice,decent person to be around again, it is because he is happy in his current marriage. My dtr. said it best when she said her Step-mom is exactly what her Dad needs in his life at this time and my husband is exactly what I need in my life at this time. A very astute observation from a 25 y/owithout much life experience to work with.