Thank you 
I'm just so sick of it. And as pp have noted it can have fatal consequences.
Amber peat (RIP) is the one currently in the news, and I know is a slightly different case, but how many times have we seen a child in the news who's been beaten, molested, even murdered and it feels like 9/10 it turns out to be the mothers sexual partner that's done it! And frankly I feel like the other 1/10 it's the grandmothers partner! Or step brothers or step dads brother etc killing them too.
I'd love to know the actual stats on this, but I suspect they're not far off!
RIP also
Baby P
Jenna Brookfield
Zoe Evans
Daniel pelka
Ella dalby
Tia sharp
Becky watts
And all others lost to the hands of these men. Although I don't think it's JUST a case of toxic, dangerous misogyny. It's also because people rushing into blending families without approach it sensibly & that creates tensions & jealousies that increase the likelihood for abuse.
"It takes about 1 years apparently to really get to know a partner" biochemically it can take up to 18 months for the hormonal reaction that causes the "rose tinted glasses" "falling in love can see no fault in them" to wear off. That is one of the reasons I think biological mothers (and fathers) should wait AT LEAST 2 years before even CONSIDERING moving in with someone and exposing your kids to them.
2 years is also the average point when abusers start to become more overt, though as we know there are other triggers too which can occur earlier or later.
And I wrote that ^ before I read
"once they'd been together 2 years"
Be interesting to hear from the other pps in similar situations what the timescale was. If they're willing to share.
My experience is slightly different as it was my biological father that was the problem, but I can relate to the pps who's relationship with their mothers are now permanently damaged because when we became adults (and especially parents) ourselves we realised they should have protected us and didn't.
I'm 46, I'm vlc with my parents, nc with my sister & various other relatives and low - Med contact with bro, as a direct result of my childhood. My dd is nc with my sister & dad, vlc with my mum.
I have serious mh issues that are at least in part due to this. Although it's taken me a long time to accept & understand that as until my 30's I was "fine".
Do you want your dd to have serious mh possibly addiction issues? To want little to do with you when she leaves home (possibly at 17 as i did?), to not want you around your grandkids?
Is he REALLY worth you losing all that?
I've been a single parent since dd was 2, I've dated but nobody's impressed me enough I wanted to make it permanent, a couple came close but there were other issues. Dd only knew ABOUT 2 of them and only met 1. Her safety (inc emotional) is more important to me than any potential partner.
She's now almost 18 and (I hope) has a healthy attitude to relationships and certainly doesn't take shit! She's had her heart broken (believe me it's worse than your own but part of life) but she won't tolerate bad treatment and she counsels her friends likewise.
Do you want her to accept poor treatment from friends & boyfriends/girlfriends? To place herself lower in priority than everyone else?
I cannot imagine you do, and certainly not consciously but if you let this man stay, you ARE now consciously making a decision that could well lead to these or potentially much worse consequences.