what should i do? please give some kind of advise

my girlfriend is a bit of a flirt, 2 guys that she knows have started to like her and 1 has even said he loves her, i leave for the military within the next 6 months and im scared shes gonna get bored waiting (iv never asked her to wait, shes choosing too) and im scared shes going to look for the attention that im not there to give. i dont kno if im just paranoid and have nothing to worry about or i should just talk to her about it.