Wow that sounds hard. I'm so sorry you went through this.
I can see why from the outside it would seem like there are similarities, but really, there's not. I think I'm just really bad at explaining myself, especially when I want to get all my hurt out and it leaves the story very one sided.
He's currently (and has previously) dating models mostly because this is who he has access to through work. He would most likely be seeing more and varied women except that the times he's around people that he could get to know and have a chance of hoping up with, I'm there and he knows it makes me uncomfortable and so doesn't. In the past this wasn't always the case. His past relationship was also a model but an alt one and so she wasn't the stereotypical skinny tiny young girl and as such I felt far less threatened by her (except that she wasn't a nice person and made everything difficult).
To clarify regarding inviting a girl to the house.... She didn't COME to the house, because I said no, my partner would only have had someone there if I had said yes, he broached the conversation with the other two girls to access their availability before approaching.... This still isn't ok with me, but in his words he didn't want to raise a difficult conversation only to find out no one could come anyway. (Still not ok, but not purposefully manipulative or deceptive)
I know all these bad things I've shared make him sound like a real douche, but honestly, I could write an equally long post about how wonderful he is and wax lyrical forever about the good points in our relationship. He's an amazing man that's working hard for our relationship. He has even said that he would go monogamous before allowing this relationship to end, but I can't ask that of him, it's too much a part of who he is and I don't want to change the man I love in to something he's not. I want to deal with my insecurities and make what we have work. And if I wasn't 100% sold on this relationship I absolutely wouldn't be investing so much effort in it. So, trust me, he's definitely one of the good ones, he's just been a dick and made some stupid mistakes, and so have I xxxxx
Mmhm, I thought my ex was a "great guy" the first year too... The fact remains, he invited 2, or was it 3, women to come to YOUR house and be with him with YOUR kid in it while you were away, all before having even discussed this scenario with you.
I hope it's all less weird than I read in your OP. I truly do.