letting go// any suggestions?

[peacetoday]

Hi
Im transitioning from MLC
been there for about 2 years
d in progress--I tolf Him to file- he did
I just found out about ow
H living with ow..he has lied about her and been with her 2.5 yeras I think

so im tring to detatch and keep my distance now
H and I have been friendly and got along well with many continuous positive connections for 2 years
he visits kids 3-4x a week here at my house

no intro to ow yet, but in the D agreement he wants to introduce ow to kid in 9 months and overnights in 15 months from now

so I have a while
H has lied about his A this whole time
he only admitted it when I found his lease agreeement
so I have detached and distanced- little talk
and we share a business together which we will both keep in D
he seems to be reacting to my distance..and some of the limited visitation I have asked my L to write in agreement
I dont want my kids around OW
so
sometimes he misses work,,has not seen kids for a week
wont talk to me he wants me to react or let the whole thing go
like he didnt really have A//just forget it and be friends??

but I know it is the heathiest for me to move on
I have created a life
I am positive
I have friends
we go dancing
men have asked me out Ive said no
I want to take time and make better choices than H
I want to start dating soon

but my heart is stil;l atteched to H..
I have struggled the past 2 weeks really letting H go
little chit chat only when neseccary

How do you really let go?
Is it just practice?
Is it limiting any emotional connections?
is it setting boundries?
being cordial? but not close
is it forgiving but still choosing to not be friends?

I have a lot going for me and If I can transition out of this D I feel I can attract a heathier R next time
any suggestions?
Thanks
peace