Yo M I’m 20 months post D and I sometimes have bouts of sorrow. Not about my ex but the loss of the family unit. I’m not gonna lie you have a tough road ahead but you will get through it. IMO you did the right thing. I know this is a divorce busting site but your W has a boyfriend and that is completely unacceptable. Not to mention you’ve only been married for a few Months. She has serious issues she has to work through. If she can then down the road you can give it another go if you do choose.