Oh i can hear the despair in ur voice. U don't see it now, but this will calm down. Was it just a kiss or did more happen & who saw u doing that?? Flirting is fine, u can just laugh it off, im sure ur making more of a deal of it in ur head that ithers are.
I would give ur hubbie a bit of time & c what happens. Ur going to feel like **** for a while but alot of that is the booze, i felt anxious, guilty, panicky, depressed & generally miserable. I thought about drinking ALOT & just thought "my life is dull without booze"....such a crock, i have great days & ok days, no bad days yet. Im 6 weeks sober tomo so still in the early days.
I too have let my fiance down several times, not in the same way but by hiding my drinking & just being very sneaky. The only way he said he can trust me again fully is by showing him ive changed, time will tell.
Good luck & please keep coming here for support. It will ease.x