I'd say that is a lot to face daily. I was in the same situation many years ago, my ex got together with another woman we both worked with while we were still together. I can tell you it was awkward and uncomfortable. I don't know your circumstances but I know in my case, I didn't want the guy back. They got married and I ended up quitting my job long before as I didn't want to hear all about their relationship or to see them. It was the best decision I could have made, I couldn't even begin to start to heal until I did.
The techniques will be great for you to focus on yourself. If I knew about PW and BWD I still wouldn't have wanted him back but I'd have jumped on doing the meditations and EFT to move forward.
Much love. ❤