Guys like this are really creepy. You really think this fucking girl wants to go out with some punk who hit her up at a gym? No dude... maybe thats why she fucking mentioned she had a boyfriend within 5 seconds of meeting you. Take a god damn hint bro...
Dialogue between men and women -- just like within the political arena -- means nothing. Each side is always holding back, always hedging what they say. The fact that she mentioned she has a BF may not mean what it sounds like. Maybe she said it to test your reaction. Maybe she's on the edge with the guy and is testing the waters. She might want to know how you would react to her already being involved. Who knows what she's really thinking? Nobody, except her. Play it along and see what happens. Sometimes a woman in that position has no intention whatsoever of cheating, but if one is persistent enough it can happen anyway.
I don't think a relationship with this girl is on his mind lol And OP don't shit where you eat!!! just saying