<human>: I [f20] met him when he was still with her [mid 20's] even though their relationship was failing. They were in a toxic relationship for 1.5 years where he felt she was an emotional burden that he felt too guilty to leave (she had family issues and thoughts of self harm). 

We talked a lot, she found out, things got messy. For example, she contacted me and tried to push me away from him by saying bad things about him. Long story short, they broke up and we started dating. She struggled a lot in letting him go, kept talking to him, etc. But he moved on quickly.

We've been dating for a few months now and today we had an amazing time celebrating his birthday! It was nothing short of perfect. 

However, I came across his ex's instagram post today. With a selfie, she wrote something along the lines of "I said happy birthday a year ago today to a person I loved. I loved him but I was also crying because he didn't care about me. I feel so foolish looking back and I am so happy now. Thanks to the people that have been there for me."

I just feel like it's so rude to make a post that puts the person in a bad light on their birthday.. It's the one time of the year that is special for them! I have an ex of ~2 years but I personally wouldn't say anything and just move along. It makes me doubt that she even fully moved on. 
 
There's nothing I can do about that post. It's a damper to my boyfriend's birthday so I will not discuss this with him. There's no point. I don't expect people to be able to explain her POV so I guess this post is kind of a rant.

Can you provide a brief overview of the text?
<bot>: Boyfriend's ex couldn't let go of him when they broke up. It was a perfect birthday celebration today and I am frustrated about her instagram post about him. This is more of a rant.