is this breaking girl code? Please, asking for advice.

Problem: I'm still in love with my ex. But the he isn't, and I'm fine with that. But he still treats me like we're still together (holds my hands, kisses me, and hugs me). Last night we went on a walk which ended in us having sex. We agreed to being fuck buddies, but I feel like I only agreed to it because I didn't want to lose him or have him fuck anyone else. I agreed out of spite. Then, the next day I found out that him and my best friend are going out on a date on Sunday. I asked my best friend about it and she said she's doing it for free burger. The conversation goes like:

Context:

Me: you're going out with ___ this Sunday?

Her: yeah, for free burger lol. Is that alright? I can cancel, but you have to get me free burger.

Me: I'm gonna cut the bullshit and say this shit genuinely pisses me off, i sure gave you my blessing but it doesn't take a way the fact that my best friend is going out with my ex for "free burger" don't you already have someone who's rich enough to buy you 10 burgers. I honestly can't force you to not go out with him but if you do I'm going to have to force myself to distance myself from both of you. can you be a little more idk thoughtful or something because I would never go out with your ex even if I gain something.

Her: I only ever said "free burger" to make it feel light hearted, casual more of. But if you want to cut to the chase then sure, I am a bad friend. He asked me for a date, then I said yes. Simple as that. I'm not going out with him for the sake of gaining something, truth be told, I'm not gaining anything and I'm not expecting to.

(She replied to me saying "can you be a little more idk thoughtful or something because I would never go out with your ex even if I gain something.") Her: so you're saying I'm not thinking of it?

Me: looks like it.

Her: and why's that?

Me: are you seriously asking me that.

Her: does it not look like it?

Me: how oblivious can you fucking be

Her: much more than you can think of

Me: Fucking Hell ____ how can you be so fucking dense???

Her: and you're not?

Me: OH SO I'M GETTING ANTAGONIZED FOR FEELING LIKE SHIT CAUSE MY BEST FRIEND IS GOING OUT WITH MY FUCKING EX???

Her: Now you know what misty felt like I guess? Yay for 1st time experience

Me: you're messed up. I don't want to be your friend anymore.

I blocked her and the conversation ended. I had also confronted my ex about it and the conversation went like:

Me: You obviously don't care about my feelings at all.

Him: I care

Me: you obviously don't.

Him: but we agreed to be just fuck buddies nothing more nothing less. To meet our hypersexual needs. So I don't get it, I don't get you.

Me: (i unsent a message)

Him: what did you say?

Me: it doesn't matter what I say, in the end I'm always the one whos pathetic and pitiful. The loser, lol.

Him: why??

Me: You. Don't. Care.

Him: I care. I always make you feel loved. when we are together, i always hold your hands, always kiss you, always hug you, cause you're important to me. you always trap yourself inside your own mind

Me: Yet you do this bullshit? Going after MY BEST FRIEND

Him: I did not mean to. She just resonates with me more.

Me: how the fuck would you feel seeing your ex, whom you still obviously have feelings for, go out with you best friend and only treat you as a fuck buddy even though yes you both agreed to just be fuck buddies but deep down you know you want more but you can't because your ex just doesn't love you that way anymore

Him: I don't know.

And that's where the conversation ended. What do I do? I'm so hurt.