Guy's Behavior

I feel jealous when she's having fun without me.

This is something I've noticed happens a lot. It seems like a petty feeling to me, but when I hear that my girlfriend is having fun, and I'm not a part of it, I feel jealous. Kind of sad as well. I guess I feel like I wish she had that much fun hanging out with me or something. I want her to be happy, and I love knowing she's happy, but it's such a mixed feeling. I just recently heard her laughing a lot and having a blast over the phone, and I haven't heard her have that much fun much with me. I'm not really sure what I'm asking, but I guess it's that is this normal? Is it bad to feel this way? Why do I feel this way?

I never want to spoil her fun or make myself part of it to fulfill my selfish feelings, I just feel jealous and sad sometimes. Happy for her happiness, but sad cause she seems so happy and I'm not the reason for it.
I feel jealous when she's having fun without me.
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