It didn’t sound like you two are actually a couple. You’ve known each other that long and by now you’d know if you two are serious about each other. You don’t seem to know. Plus you don’t feel stable enough to be in a relationship

It sounds you two are meeting more as friends even though some kissing takes place (usually when intoxicated). I don’t see why she can’t give her number to guys.

If my husband (now or when we dated) gave women his number it would be ridiculous but our relationship is clearly very defined and is monogamous. Yours isn’t specified.

If you feel you want more than friends or friends with.benefits situation snd want exclusive monogamous romantic relationship, then speak up. Otherwise I don’t think you have rights to demand she must not give men her number. Sure it would be wiser if she didn’t do it in front of you but situation presented itself