Having tried for this a few times now, the only way I see this working out long-term is if they also have a romantic partner but that can be a difficult thing to balance for all three people.
This is awesome to hear about.
I get this too, though usually the only person I really get jealous of is the persons romantic partner. I don't want to be romantically involved with them but I feel bad about their romantic partner monopolising them.
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So, lets start with the fact I don't feel like I crush at all. But my squishes are fast and furious, especially if I act on them. If I don't then they can drag out for a few weeks at most. If I do pursue them though they can die down in as little as a day or two.
* My squishes are triggered by interactions with the person - this is a defining feature to me. Crushes seem to able to be directed at virtually anyone; see also love at first sight.
* Strong feelings of connection and a desire to talk to and spend time with the person
* I get a strong urge to be close to them physically, hugging and such - it's hard for me to decide if this is actually part of the squish or not because I have this feeling with all my close friends. May be tied to the above point - feeling super connected despite barely knowing them yet.
Someone mentioned not wanting to kiss as being a defining feature for them but I feel like this isn't true for all aro's. It is probably a helpful guideline for greyro people though. For me, I don't get an explicit urge to kiss my squishes, though I might if I felt in the mood to kiss and they were ok with it.