So I was with a girl for 2 years and she had bpd. Didn't understand it ....or her splitting on me....took it personal and usually snaped back worse with things no human should say to another flash forward to now....we are friends. She is dating someone long distance, I have helped her get into threapy and have started going to threapy myself. 

She is having a very hard time with things mostly due to dating this person that she will not be with for 8 months and I'm concerned it will send her into a spiral as it is already taking a toll.

Me and her have gotten close again....we were always great friends and got along.....now the sex is back.....better and more often than it was when we were together. 

So my threapist today decided it was time to tell me that I myself have bpd. It makes sense and makes me see how my snapping on my ex was acually splitting.

Question is how do I tell her. My threapist wants me to write those sorry letters that you never send. But I feel like she deserves to acually get hers.