For ur first question. If a girl made a guy cry, that mean the guy must have really loved her. So yeah, it is more than enough proof that the guy loves her. As for ur 2nd question. When a guy loves a chick, the symptoms are d/t guy to guy. But what i know is, the guy will be nervous when talking to her, He is always near her, tries to start a conversation with her, will do anything she askes him to do, she is always in his mind, he gets jealous when she talk with other guys and so on. There are a lot but i think those are the common among most men.