Good to hear your update. It sounds very positive over all.
In terms of the sunk costs with your husband I can relate. I did so much leg work on getting my wife's visa to come over, and took time off from work just one year ago to attend her naturalization ceremony. Not to mention all the the time, love, energy, and support that we both invested in the relationship. Letting go of those sunk costs is hard. I think that is what causes me to still be resentful of my W's choices. I can accept that I will never get that money, love, or time back and am ready to move on from it, but it's hard to forgive.
In terms of the new work "friend," it's hard to tell on here if it is flirtatious or simply very friendly. It definitely sounds like something you should pursue and see where it goes. No expectations. At the very least it is GAL, and if it turns into something more, even better! I've always found that that is the best way to date - don't weigh things down with expectations but enjoy the process of going out and meeting new people and having different experiences.
I'm glad to see that good things are coming your way. Enjoy!
W 34 Me 42 Married 7 years together 8 0 kids 1 beloved dog BD 4/6/2018 I moved out 4/7/2018 I moved back in alone 8/05/2018 I file 3/06/2019 D official 5/7/2019