my girlfriend whom I love very much confessed something to me and i need advice

greetings gendered and ungendered persons, my girlfriend came to me recently with a confession, and I want to get advice from people who may understand her better than I do (even if thats from fuckin reddit). For context, me (straight) and my girlfriend (bi) have been together for about half a year now, and before her I hadnt really had proper experience with the LGBTQIA+ community, although I do pride myself on being the very best ally I can be. my inexperience, though, may sometimes be a cause for misunderstandings and a lack of knowledge on my side.

now to my real inquiry: recently my girlfriend came to me saying she had to confess something to me. apparently, though she does love me, cherish me, think me enough for her and think im the best partner ever, she still says she sometimes has the urge to touch or kiss women/she 'misses being with a woman'.

immediately I could tell she felt extremely badly about this and that it wasnt something she could control. still, i couldnt stop myself from being upset about this (to me it sounded like she missed being with other people even though she specified many times that she didnt want anyone else and that she loved me more than anything and crucially she also loved me for the gender I am, she didnt ''wish I was a girl'' or anything).

after questions from my side she specified that a) YES, she really is bi, not lesbian (with a preference for women, but still very much bisexual), b) she is happy in our relationship and doesnt want to open it (she's not polyamorous or whatever) and of course c) she loves me more than anything.

Though I was upset at first, i knew I did still love her and that I wouldn't leave her over this. I tried to console her, but such a thing, of course, is a futile exercise when one is upset themselves. a bit later, right now, I am no longer upset, and I now only wish to understand the way she feels.

this is where you people come in: I would really appreciate it if people could give their thoughts on the matter, how I can be a good boyfriend about this, and whether or not this is a shared experience of other bisexual people. so yeah, what do you guys think?