Is my friend doingthis intentionally or what! am soo confused?

my close friend get cold sores all the time, and she has this Bad habit of wanna share food or drinks with me all the time! i seriously don't like eating or drinking after people not even my family members, it actually bother me when i see people drinking from the same cup. she does that every time we go out to eat, one day she even ask if she can taste my drink and it was just a soda! deep inside me i was like its just a soda you can simply get up and get your own, now i have even begun to think that she is doing it intentionally anytime we go out she either wanna taste my drink or my food or sometime..like yesterday we were eating breakfast in a restaurant and she offered me her egg with her folk like"taste this" i was like i'll get it with my folk because i don't want to share utensils with her, i'm so paranoid because now she got cold sores again. i don't get it why does she feels like i have to taste her food and most of the time its just regular food that i already know how they taste, like orange juice, soda, smoothie,? it drive me crazy i jts wanna sream, and she knows i dont like it from my reaction but she is still doing it. also i dont have this problem with my other friends its only her, she is a nice person and cool to hang a round but when it comes to table maners she doesnt have none! sometimes she can randomly touch your food or smell it too! very weird. The main reason why am thinking that she could be intentinaly doing this is because what slip out of her mouth today, she got both types 1 and 2 virus and she was like "this is one of the stds that you can simply give somone and they wont even know because you dont have to tell them you have it, and they wont prove if you gave it to them" she was laughing too. . that kinda made me start thinking otherwise about her