Move on. you are the other woman and he does not plan on leaving her for you.
It depends on where you meet them
If you like a guy and he has a girlfriend then you should back off and only try and be his friend.
give her one more chance if she breaks it DUMP HER
If the boy has a girlfriend, find a guy that doesn't have a girlfriend.
wait
Because they're insecure.
If he's lying to you now, there is a good chance he will lie to you later if you started dating him. As long as he is still dating his girlfriend, you should keep your distance. He might like you, or he might be enjoying the attention of having a girlfriend and having you like him at the same time.
No of course not!
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He has a girlfriend. So you butt out. It's not complicated.
you use his girlfriend like a ladder and jump over him
Well, its ok for them to hang out. If you trust her, then yes, if not then go with her. Like a double date.