I am going through the same thing as you ATM so I feel for you!
I also felt sorrow each time I came home & yet more of his belongings were gone.....
I asked my H of 10 yrs to move out after his untrustworthy behaviour got worse. So what does he do, he moves right in with the "very nice work friend". It's all my fault & he has been "unhappy for years" & the "marriage was unsalvageable" & "I fast tracked their relationship from 2 months to 6 months"- I compared by H to his father who he despises because the father cheated on his mother for 7 years. My H is not like his father because "nothing happened until he left" as in 2 days prior to him leaving the marital home. That was "very unfair of me"!
Oh & his ex cheated on him & he said he would never ever do that to me! He even told my 9 year old niece that cheating is the worst thing a man can do to a woman. But like my H says he did not cheat......
I have been doing NC for 2 months now & only broke it last week to respond to a text to request lawyer details. I highly recommend it! I did not realise how empowering NC is as my silence has really unnerved him & he has tried without success to break it! I have remained cool & calm while he has shown anger.
Unfortunately I have not being doing well in the last week & keep thinking about what could have been. I'm back to blaming myself for his cheating. He is no longer the caring sincere good guy I feel in love with. That man has gone & been replaced with a snake. I have finally booked in for IC & my first appointment is tomorrow.