Very Sad!

Cry if you need to cry....
My separation took place 3 weeks ago - and I stll cry.
It's necessary.

Then you need to face the point that - if you want him back - you will never ever get him back the way he was before.
You should actually have the goal to get him back BETTER than he was before.
But that means a lot of work for you.... which you have to start straight away. Coz it means that you have to work on yourself a lot.
Read DB - if you haven't so far!!!! As quick as you can.

And FORGET about her. Neglect her. you already KNOW she IS there. But thinking about HER gives her way too much significance!! Which she does NOT deserve. Definitely not.
The only person of significance right now is YOU.

I am just trying to think about what you could do to feel better - if LRT is not a good solution, as you say you've been leaving him alone a lot.
Maybe you tell us at what times you have left him alone and why you were only talking to him when he asked you something...
That could help!

Big hug again,
nanah