Hi, welcome to the site. In a way my situation and yours are similar. We had a very passionate marriage. Never argued- h was always affectionate and obsessed with me. After a month of him being a tad distant he drops the d bomb.
I since found out he is having an affair too.
I haven't much advise as I'm not a vet and relatively new myself. All I can say is try and take care of you in every way. Find someone you can talk to/ vent too. I'd say it gets easier but I'm not at that point yet.

Wishing you luck

Me 26 H 25
M 4
T 5
Baby born 4/14
BD: 1/15
EA: 2/15
PA: 4/15
reconciling: 4/15
ILYBINILWY- 11/15
ILY-1/16
ILYBNILWY 4/16
ILY 6/16
ILYBINILWY 6/16
Baby due 3/17
BD 8/16