How to let it go knowing it can't go anywhere?

Anonymous
So, I think I'm just in a sentimental mood from too many Hallmark movies, but I'm feeling a bit stuck. My brother and I are fairly close in age, so we've always been friends with each others friends. Inevitably, there have been crushes on each others friends since like, middle school. We're in our mid and late twenties now. We live about two hours apart, and neither of us have a good relationship with our dad. To help ease the tension, it's not uncommon for at least one of us to bring a friend when we're at our parents. His current best friend is a REALLY incredible guy, and usually comes unless it's a Holiday and he's with his own family. He's got an amazing heart, and is great for my brother. He sees me too, though, and I appreciate that. I only see him like a weekend a month/couple months, but I always look forward to it. He calls me by my nickname, not knowing that others ever did. Remembers all the details about my personal life, and has my personality pegged from character values to how far to take a joke. We have fun, and I feel seen. Last time, when they were pulling out of my parents he even made a hand heart out of the car windshield, that I believe was directed towards me. Here's the thing. I personally think he's pretty attractive, and that we'd be super compatible. I'm not sure how he's sees me, though. I feel like there's a big chance that he just sees me as a friends sister. Maybe even a sister to him. The other issue is that he's been talking to someone for like six+ months now. I don't think it's serious, and I know enough about her to doubt their compatibility. But I feel awful for even seeing him that knowing he has someone, even if it is casual.

So I'm not really short what anyone could do in terms of advice, but on the off chance someone has some tips, I'd appreciate it. At this point, I'm trying to figure out how to let jt go, but I hadn't been able to tell anyone, so it's been bottled up for several months.
How to let it go knowing it can't go anywhere?
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