Man, here is my 2 cents. All of my friends, family, co-workers, and I have already know. We have all been in the situation. A girl in Highschool is going to cheat on you. It has happened to me and everyone else in the world. It happends. Usualy when the other person starts changing their behavior, its time to start checkin in with them on whats going on. At time it means that person has done something wrong to you, so to protect themselves, they start checking in on you or just simply bringing the idea to the table that you might be cheating on her. Its hard to put it in words my man. My cousin once told me, who is 9 years older and wiser: Its First love my man, it will break off. One month later, it happened. Dated her for 9 months. My first love. Its aight. Im much happier now with my gf now. Sorry, had to bring another side of the conversation to the table
What I advise you to do, not to snoop, but rather see if she is up to anything. If she isnt. Then you got yourself a good girl there so far. But remember, girls can get just as bored as guys. Maybe she is trying to push you away? Maybe she is trying to keep you closer. Just see if she is trying to figure it out. Go plan something with your buddies like a vacation man. It helps. When my girl and I were at each other constantly, we took a break. It works wonders man. Just dont do anything stupid on the break if you want to keep her.