Genuinely thinking about it: he would be sad jealous, because jealousy, if recognized, is a negative emotion, and especially if we talk about Kalim being jealous of someone getting close to Jamil – but Kalim is way too used to suppress negativity. And I think it would get worse if Kalim witnessed himself being replaced by someone else 😙 but I am curious to hear your thoughts on this. To be honest Kalim strikes me as a very secure guy who never gets jealous (being generous as his main trait), but any extreme case is possible.
And I also believe Jamil would try to make Kalim jealous on purpose because he is just evil like that (imo he'd be like the most jealous of them two, but he is unregulated and Kalim is just generally dissociative)