Is it okayto be jealous?

I like this guy who has a girlfriend. We are amazing friends and have been through a lot with each other. This girlfriend is long term and has never been fond of me. I talk to the guy all the time see him a lot and do a lot of sexual things together. Sometimes it feels being led on even though I know he is not interested. Is it normal to get jealous whenever he does something with him girlfriend and goes away for a night but never considered doing that with me?

Is it okayto be jealous?
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