Sending you kind thoughts and empathy. I am very close to my two, and made being their mom my #1 identity after I retired to be a stay at home mom. I took all that energy I had put into my career into being the best mom I could figure out how to be, and to try to stop history from repeating itself with bad family mojo and the many poor life choices that I grew up witnessing and experiencing. Letting my kids go, and believing that I had taught them how to fly was incredibly hard and life altering. Almost like getting a demotion at work, because once they fly, they usually don't need you as much as you might hope.
I'm sure you have done your job well, your son will likely flourish and find his way. Worry will always be there because you are a mom, there's no changing that. What I recommend you do now, is watch all your hard work come to fruition as your son finds his way and becomes a grown up who can handle most of what life throws at him. Relish those moments he still needs his mom, but don't make too big a deal about it :) You will be amazed at how he continues to grow and change and find his way.
Your job now is to be his touchstone. Be there if he needs you and don't make him feel guilty if he doesn't. But keep your finger on the pulse of how his life is going. Be sure you check in with each other in whatever format he prefers. Trust me, instagram, snapchat and so many other apps were not something I picked, but my kids hang there and are gracious enough to include me in their online lives so I use them now too. We text, we talk, and they still come to us for advice which is awesome.
Remember all those things that made you a good/cool/fun mom? Go do more of those. All the things I shared with my kids - music, art, museums, nature, you name it... I do as much of that as I can fit in to my still busy empty nest life. I share all kinds of interesting stuff with my kids and surprisingly, they do the same right back at me.
It has been my greatest joy to watch them find their jobs, friends, hobbies, and build the lives we helped prepare them to live, and I hope you get the same feeling watching your son become a fine man. I grew up with a narcissistic needy and guilt mongering parent, so I vowed to be none of that with mine, all the way through, and I think that has paid off in spades. It has helped me let go, having witnessed how hard it is to be the vehicle for a parent to live vicariously through, and to be needed beyond what seems normal from a parent.
When they left, one more slowly and more painfully than the other, I was very sad, and I felt lost. So, I re-engaged with myself, my life and my friends and we were all doing so much better than I had hoped. Life was good, and I was on top of the world when mine fell to pieces discovering long term infidelity. The good news is that your discovery is behind you, so you can focus on yourself now, as you should, while your son makes his life his own. I hope you enjoy your new free time and his growing independence, and can be proud and comfortable that you did your job well. Best to you.
[This message edited by whatisloveanyway at 10:51 PM, Saturday, September 18th]