Why is this a issues in almost all of my relationships but one?

Anonymous
So pretty much almost all of the girls I date will have the one guy who always flirting with them.. which is normal just one sided. They will always say o it just a friend he like that to everyone always making excuses. The one friend will then turn into girlfriend slowly flirting with them once we get into a disagreement or it turns into them sending nudes after months. My most healthy relationship had turn out this way and this slowly turned me into a guy I I’m not.

My current relationship was healthy for the first two 3 years then we went through some hard times during the 3rd year then she ended up sending another guy nudes.. and other stuff said it was Because we need the money. I got upset told her it stops now or I’ll find someone else and that she needs to see a therapist so we can get our kids back. She kept talking to him behind my back wouldn’t see a therapist like the judge order her too. Fast forwide 3 years she signed her rights away to our kids. I got really upset told her I was done then find a new girlfriend. We ended up getting back together in a poly relationship.. I left the other girl tried working it out with my girlfriend of 7 years but recently agin she sent the same guy nudes 3 days ago. She often blames it on the fact that I treat her differently since she signed her rights away or she’s worried I’ll find a new girl agin or cheat on her. I told her that was no excuses since being in a poly relationship I’ve been a more honest men. I really wanna make this relationship work but tried of all the women I date sending nudes out or allow men to flirt with them. My ex the one I left for my baby momma was the only girl I dated that didn’t send nudes to another men. My current girlfriend gina wasn’t like this but she now has ptsd for the past 4 years that she refuses to get treated. What should I do? It’s like she’s a different person now
Why is this a issues in almost all of my relationships but one?
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