AITAH for giving my best friend advice abt her relationship?

AITA Hi everyone, so I (16f) have been friends with my best friend (16f) for about 4 years now, I have witnessed her life through thick and thin, and met her whole family. A year ago she started dating her current bf (15m), and how there whole relationship started was interesting. So I had had a hallway crush on her current bf for about a year and every time I mentioned that he was cute she would make a weird face and say that he wasn’t. Fast forward to that summer, we had figured out that he wasn’t friends with one of our friends and asked if he wanted to come to a pool party we were having to celebrate the beginning of summer. He came and we all got along well and I developed a bigger crush on him. One day about a month into summer I had my best friend text him telling him I had a crush on him, and at this point I had a few concerns about how my best friend was constantly snapping him.

To the text she had sent he replied saying that he doesn’t feel the same way about me. I was crushed and had never really felt that way before, a few hours go by and my best friend calls me and continues to confess that she did in-fact have a crush on her current bf. This hurt but I said that if he felt the same I would be fine if they dated, they then started dating and at the beginning I was heartbroken but soon learned that he wasn’t really my type of person anyway.

About 6 months go by and he started showing his true colors, he stopped putting in as much effort, he disregarded many of my best friends boundaries, he told her what she could and could not wear. After they would argue constantly my best friend would eventually let in and accept his really backhanded apology. She stopped texting me every day and calling me all the time like we used to. It caused me to fall into a deep depression because I felt lonely, and unappreciated. I talked to her about it and we eventually made up. Fast forward about 4 months, he continued the things he was doing but an event happened that I can’t rlly say on here but it caused my best friend to cry into my arms and we both agreed that she was either gonna break up with him or take a break. She ended up doing neither and telling her bf that I told her to break up with him, causing him to be pissed at me.
So AITAH?