Honestly, as best I can tell, if they still showed me attention and affection and we did things together still, I'd be happy for them.
The only jealousy I've experienced has been for straight up platonic friends, because I saw them giving something to my partner that I don't give. I got over it. I can't be everything for 1 person.
I don't know what my boundaries are, they've never been pushed, haven't been close to pushed. My partners' own boundaries for themselves have always been smaller than mine for them are.
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Not autistic, I think
Prone to depression
Have celiac disease
Poor motivation