Sibling betrayal???
So my sibling used to be friends with this boy, I'm just going to call him Daniel for privacy issues. Here's the backstory, Sibling and Daniel got really close within a short period of time in school and the relationship was pretty good for a while. I would hear back stories that kinda sounded like Daniel had a crush on my sibling but my sibling and I just kinda laughed about the possibility and went on.
At some point, I got introduced to Daniel and we all became a little group. I began to see Daniel as an older brother figure and we had a cool banter-filled friendship. However, during this period of time, Daniel would sometimes be a bit weird with my sister; clingy, emotional and stuff. Eventually, he confessed his feelings to my sibling but my sibling wanted them to remain platonic and not to move too fast.
Things got a bit awkward from here. Little arguments that balanced out between from being Daniel's fault and my sibling's own irritation. I was kinda stuck in the middle of everything. I remained on talking terms with Daniel since it felt like we were real friends and that he cared about me sincerely.
Eventually, an incident happened that caused my sibling to ask for a non-contact phase between them and Daniel. They haven't spoken for over 2 months but I was permitted by my sibling to continue texting him since no conflict came between us.
Daniel has done some very annoying and unreasonable things to my sibling that ultimately caused this fallout that I agree with. I sometimes try to jab at him jokingly about those things. However, I ultimately decided that I should stop interacting with Daniel since I was under the impression that he seemed to be venting his issues to me only to reach my sibling somehow.
He recently seems quite lonely since my sibling was kind of the only person he cared about in their class and I can't help but pity him. Simultaneously, I find his actions towards my sibling the result of poor judgement. It can be hard for me to rationalize him being a funny, caring and similar frequency person from the guy who lowkey obsessed over my sibling and was a bit dramatic about everything.
I'm generally a clear headed person but I don't know if I should still be friendly with him or continue to cut off all contact with him. I feel a strong sense that I shouldn't but that I also really value his friendship.
It's so confusing to go about this and I feel super mixed about this. Maybe because I don't have many friends and the fact that we really click is making me duel on keeping his friendship.
Advice and opinions would help!