I (24m) think my friend (24m) is trying to bang my girlfriend (23f)

I gotta start with some context: My friend D had sex with my girlfriend L before I even knew her. I don't know how to put this, but my girlfriend wasn't exactly a shy girl before I met her. So she had sex one time with D after a party, and at another party after that she had sex with him and other 3 of my friends during the same party.

So when we started dating it caused some conflicts with my friends saying that was a bad idea. Then we became exclusive and things started getting a bit more serious between us and sometimes my friends would still say disrepecting stuff about L which caused some tensions in my friend group, and D was one the ones who often would speak shit of her when we weren't there.

I love L and she's great, we grew up a great deal together and she's a completely different person now, but we had some downs as well in the beginning of the relationship (not it's almost 3 years).

So like D gradually became more frendly towards her and trying always to get to seat close to her and stuff which I really didn't notice at first. Then when we make some party and put music he like trying to dance with her, and sometimes he even grts to close making her unconfortable to the point she doesn't even dance anymore. And he's increasingly making jokes about them having sex before we met which nske her really unconfortable. Also like every time me and L get closer or kiss one way or the other he interrupts us with some excuse. In the last party I literally walked in on L almost passed out drunk, like completely busted after some drinking game they did, and he was kind of holding her clearly with his hands in very inappropriate spots and he said he didn't even realise. Next day when L sober up told me last thing she remeber is she didn't understand the game and was always losing and drinking.

Every time I ask him to stop doing some of that he says like L is making me crazy, I'm too jealous and possessive. Made some bad jokes implying that L is my prisoner, which is ridiculous. And he doesn't get to say how I snd L behave to each other. My friends are very divided on the issue but it's starting to annoy me very much, especially when he like seems to be frustrated and starts making references to L having sex with my friends (or him) masking them as jokes, when he knoes perfectly that makes L very unconfortable. It's starting to getting into my nerves.

Am I seeing things? All of the above to me looks clearly like he's trying to cause troubles between me and L to bang her again or something, and even if not I feel like I've been patient enough with his "jokes".

P.S. D Is a very charismatic guy and really "smooth" and easy going, so it's easy for him to get away with all that allusions masked as jokes, I can't give you an example because the english translation wouldn't give the idea.