Personally I feel that if I am willing to let my partner enjoy a dildo with or without me I should be able to enjoy a pocket pussy when desired.

If this is causing an issue in your relationship please mention it in a non judgmental way to your partner. Either way around if there is a miscommunication that bad someone will break and feel the other isn't giving them enough attention. There's nothing wrong with occasionally doing some sexual exploration on yourself. Everyone does it they just don't admit it.

My girl was the one who gave me my first pocket pussy, so I guess I'm a lucky man. It never even occurred to me to be jealous of a realistic dildo, if we put this other way around.