She laughs , talks , smiles, flirts with me in absence of one guy, whereas, infront of that dude.. she changes, she ignores me.. and if i go upto her to talk.. she doesn't talk to me for more than 5 mins,, what does it mean?
If she talks to him while ignoring you then yes. If not then there are other possibilities, if the other guy doesn't inspire feelings of armor within her. Maybe it's something else, maybe he makes her sad. Maybe he pisses her off, and I hate to mention it, maybe she is scared of him. Try to pay attention to her body language, especially if the other guy is talking to her. People attracted to one another usually lean in towards each other. But if he touches her shoulder and she jumps and jerks away, my money is on fear. Most important is observation, try not to make any quick calls. Just watch this guy, cuz if she is scared of him, I'm sure it's for a good reason.