Hello, this is a tough one I think. All help would be greatly appreciated.
Sorry if my English is a little bad, I'm from Belgium.

I am very good friends with a girl. She was once, for only a month my girlfriend. We separated then because she was a slut (may sound harsh, but at that time she really was) and probably because I was unsure and shy. After that we once had sex again (after one year or so). Until she got married (two years ago. I am now 25 btw and she too) there was still some attraction, like naughty dancing, touching, but not much more. But we stayed friends, and now, seven years later from the first time I met her we can still really count on each other other. While I am still aching for more, I was whole the time in fact.
Since a month she has become sexually hungry again, and she is cheating on her husband and says literally she wants loads of sex with men. She changes her clothes when I'm with her, let me touch her ass to show how much weight she lost, but I may not come any closer. If I try something more she rejects it.
And yes, I try it in very subtle, pua ways, like talking a lot about sex, trying to warm her up in different ways, but it doesn't work.

Even if I critic her behaviour, she is so incredibly hot that it doesn't matters to me.
She says I'm not her type and it would damage our relationship if there would happen anything more.

In the past I was a bad , unexpienced lover, but now this has changed totally. I would like to show her what I've learned

Anyway, or there has to be sex, or she should keep her seducing behavior for herself. Right now I still want to go for the first thing.

Thanks for reading and any advice.

First...I would never fuck such a slut no matter how hot she is, I've got standards beyond that. Another thing, you say she lets you touch her ass to show you how much weight she's lost but not letting you any further. I would definitely not be touching her ass just to give her the validation she is seeking. Can't you see what's going on? She is just a bitch and enjoys that you're so all over her. She is playing with you however she wants. She will NEVER let you sleep with her unless you change your behaviour. Be rejective. She tells you to touch her ass, you don't. She tells you to grab her boobs to see if they have grown or whatever utter BS she comes up with and you REFUSE. And I still believe that after this you have very slim chances now... Find another hottie and don't act like a wussy and jump on every single opportunity you're offered.

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What I like in life is nothing more but living it.

Yes makes sense. I think I've become a bit too obsessive on her because I know her for so long and I've been attracted and disposed by her so much.
And yes I should try to catch other fish.

But I dunno. I've been studieng pua, did maybe 25 approaches until now.
But it's really a rarity in Belgium to go and talk to girls in public. Yesterday a girl even got scared of me Still most girls appreciate my talk, luckily, but I've got difficulties to close. Main thing now is I got keep on working on my inner game I guess.
And try, try, try.

What do you mean by 'talk to girls in public?'. Like daygame? I'd say that's pretty rare everywhere. That's why it is so effective. Or is it in general? Because that would be weird if you went to a club and couldn't talk to women because it is 'uncommon'. What did you say that scare her off? I usually don't experience things like this... Oh for the closing thing. Let me get this straight. When you go there you basicly have a purpose... and that's closing. If you go there, have a nice chat and don't even try to close, then you haven't even given yourself the chance. ALWAYS try to close the set you opened. No matter how it went, no matter you think it's not the 'perfect time'. Just close. You've got nothing to lose. If it doesn't work then you are exactly in the same place as if you hadn't tried at all EXCEPT for you've gained experience.

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What I like in life is nothing more but living it.

I mean indeed daygame. I thought it is more common in the US, but that's probably because most pua movies come from there. People seem to be more social there. I'm not so into clubs, but talking to someone on a party or concert is not such a huge step for me.

Indeed you learn out of experience. I think I scared her of because she was lying in the park and I stepped straight to her in a stressed way. This was probably also due the effect of drinking too much coffee and waiting to long to talk to her. Building up stress and then going like (a/with) cannonball(s) to her.
Then she totally misinterpret my opener (she was lying in the middle of the park, I asked 'do you always like to be in the middlepoint or you just like to observe people, she replied 'doest it disturb you?')

Thanks for the advice.

Well, I don't know about the US. I live in Hungary. It's very rare here, but it's effective. You yourself see now what the problem was with that target. That's good. Just keep it up!

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What I like in life is nothing more but living it.

Thanks, I'll do, I've already tasted too much the reward of a good approach
Beautiful women there in your country