Dear you,
We used to be friends. Notice the emphasis on 'used'. That's a past tense deal now. We are not friends any more, as far as I'm concerned.
I'm pretty sure friends don't go out of their way to antagonize someone who has just ended a meaningful relationship and isn't feeling their best. True friendship doesn't involve you constantly flaunting your oh-so-magical relationship with their now-ex in a badly covered up attempt to make them scathingly jealous.
I suggest you cease and desist your little act. It's not cute. It's just a display of what a true douchebag you really are. While I'm trying my absolute hardest to make this once-romantic relationship work as a friendship- despite my anger- you're getting your rocks off by watching me suffer.
I can't believe I ever trusted you, or believed for a sliver of a second that you were my companion.
Burn in hell, you pretentious little bitch.