Hello guys,

I am in need of some advice, here the story so far:

I (M29) met this 6/7 (F28) through a mutual circle of friend in a WhatsApp group, one evening she and a friend of her videocalled with me for some hours, while this was going on I escalated via text (so her friend doesn't know what's going on, kinda 'isolating'), all was going well, she was interested as fuck, at the end she was like, remember the movie we wanted to watch? Me and my friend are gonna watch it together monday at her place, if I wanted to come along? I was ok, why not, this was my plan anyways (she's one country away, I'm in germany, she austria, ~2-3h drive for me) to come and watch it with you together.

As is was at her friends place there were 4 girls and me, I was comfortable and all the girls started talking about how their bf's are dogshit and don't let them do things and whatnot, they're thinking of breaking up, the usual mimimi, 'I deserve better'.

I was like this is none of my business but I wouldn't forbid my girl to do anything and if they don't like their relationship as it is, they should leave.

After some time I got to massage her while her friends were still around, she was tense and somewhat sweaty because she was still in a relationship, but she liked what I did and the other girls got envious.
Later they left and I stayed at her friends place with her, we started the movie, she was in my arms, after 30min or so her friend got up and left to go to her bedroom because she could feel the tension in the air.

I escalated, we kissed, we fumbled, I tried to escalate further and finger her, touch her breasts etc but she denied over and over because 'This is not right, I am still in a relationship.'. I responded that this is none of my business and think the limit she's setting is kinda random. After I couldn't get further I was like 'Okay, then let's watch the movie and sleep after.'.
We slept together on the couch, she couldn't sleep because of her bad conscience, I didn't mind.

We talked again in the morning and I was like, if you want to go home and fix this with your BF, I'll take you along and drive back home.

Said and done, I got her home, met her bf, kinda awkward situation, later she texted me, she has done it and mimimi blabla etc
And I was okay, good for you.

I kept in contact with her, we messaged once a day, she was clingy and expected me to fill the gap and be there for her heartbreak, I gave in a little bit and listened but got tired of her shit pretty fast and took my time to respond...

Fast forward 2 weeks or so, I decided to answer her again and saw she and her 2 friends I was also messaging canceled their chats in Telegram with me.

I was okay, I understand, I don't give a fuck, story is done.
After that one of her friends messaged me again and asked what's up, what's wrong etc blabla And I in short explained basically if there is no respect, I'm done.

Since then I've gone completely cold, both her friends messaged me again, I didn't even read/listen to their messages 'til now.
Maybe 1 month passed and 2 days before I got a message again from her 'I hope you are well, I'm thinking of you often'. I read it yesterday and don't know what or how to react from here on.

Now I want to improve my game, I've gotten to this point several times before, after going cold for some time the girls message me again, but I don't know how to react from here on. I tried on several occasions and never got them hot again, except one time.

So what do I do now?

I am not planning on being in a LTR anytime soon neither do I have oneitis for this girl.
I'm just curios how to go from cold to hot again in a situation like this!
Thanks for your help in advance.