Why is my girlfriend so jealous if it took me years to have a fulfilling relationship?

I've only had 4-5 relationships before I met her and I've been rejected many times, I've had unsuccessful dates. I told her about my dating past and she knows it. It is two years between my last relationship and this relationship with her, in which I had to deal with rejection and ghosting so many times. No girl approaches me unless I approach them. I am fulfilled with her, finally. I don't mind that she is jealous, but I'm not flattered either because I find it so ridiculous and far from truth. I am not a guy with exceptional looks or 'game'. You can't say girls like me now more because they know I have a girlfriend, because they don't. They don't know because I don't have to tell them. They never hit on me.

Why is my girlfriend so jealous if it took me years to have a fulfilling relationship?
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