I can relate to your story...H and I had a similar thing happen...but there was an OW...I didn't think that in the beginning and he denied it all the way...after I found out he told me he was ready to marry her!!!
I can say it sounds like MLC...I know that is what my H went through...he moved away from me and the kids and didn't contact hardly at all...he was gone for almost 2 years...didn't love me...but eventually with my DB'ing and GAL...he moved back to town to be "closer to son"...we started talking...he still didn't love me...but he was willing to try...I took a leap of faith and so far so good...he is home...has been for about a year and a half...it has been hard but about 6 months ago he was finally able to say "I love you"....
Hang in there...your doing good...the emotions are normal...just keep telling yourself you will be okay...believe in your love...it just might bring him back...my H said he finally realized that I did love him...unconditionally...not for what he provided me in years past...I gave him support when he gave me none...