He may not be actually cheating on you yet but he is definitely leaning that way. He has a relationship with someone else even if he has not officially cheated. I would bring it up to him now before it goes any further,
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Hard to say. How long has he been distant and going somewhere to take calls secretively? If it's only been a few days, then don't jump to any conclusions yet. He could be planning a surprise party for you. He could be dealing with a family or medical emergency he's not ready to share with you. If you haven't talked to him yet, talk to him now. Don't be accusatory, and simply state what you've noticed about his recent behavior. Good luck.
if you really want to know, follow him around secretly and see if he is seeing anyone else. Remember, he has a right to talk to other girls.
cheating is doing anything you wouldnt want your wife/husband or girlfriend/boyfriend to know about
Are you serious? ..... YES it's cheating. If you can't see why then try putting the shoes on the other feet. Would you feel cheated on if your girlfriend/boyfriend did that with someone else? If you think nothing of it, you should rethink your relationship with that person...
by cheating by cheating by cheating
of course you can, its cheating
It depends on your definition of 'cheating.' If you think of cheating as getting all the answers, then yes. If you think of cheating as in using a hacking device, then no.