feels kinda like cheating

so i’m pansexual and my S/O is straight. He accepts my sexuality 100% and we are very open with each other. I’ve never been with a girl sexually, but it’s something I’ve always wanted to experience and he is okay with that. He has recently told me that if I meet someone and want to experiment with them, he is completely okay with that, as long as I tell him what’s going on and I don’t hide it from him/do it behind his back.

As much as I would love to try it out and mess around a bit, I feel like i would be cheating on him, even with him knowing about it and having his blessing.

Am I overthinking things? Is it considered cheating if u have permission? What do you guys think?? I need advice 😅