If he has been good to you up until now then do not second guess him by thinking he is cheating on you. He may be busy or could be ill. Put that in your mind first and if you need too and can, then go and see him in person and find out if he is OK first and if so then ask him to his face why he is ignoring your calls and texts.
If they are cancelling your dates,saying they're busy,not replying to your calls and texts or Do all the talking TO THEIR FACE.
When he starts asking where you were? When he constantly texts or calls you and gets mad when you dont reply right away or answer. Or when he starts wondering who your hangiing with.
i am a 14 year old also so i am pretty good at knowing these things haha. well if he is constantly unable to do stuff on weekends, he is extra nice to certain (or all) girls, if he is always talking to certain girls, if he is constantly ignoring you, if he is deleting his texts before he see's you, if he is deleting his calls before he sees you, if a friend tells you he is cheating (listen to her), he is probably cheating on you. (if i think of anything else I'll let you know)
Also if he doesn't message u or respond to ur texts or calls then ovbislly hedoesn't like u anymore
Try ignoring her and telling everyone you know to do that also. Never reply to her calls and texts. Get an injunction from the court if necessary.
Yes a cellphone can because it can see the calls and texts!
Computer
emails or texts or calls
if you think she is cheating on you then no because she might just have a lot of male friends. But if she is acting suspision then just confront her about her texts
he answers as many as he can
yes