LET’S TALK!! As A Guy When A Lady Tells You She’s In A Relationship, Do You Keep Trying Or You Just Move On?

Hello guys,
They say the heart knows what it wants but what if what it wants doesn’t want it or what you want has been taken by someone else.
A friend of mine shared a story about a girl he recently asked out and the girl said she’s into a relationship.
As a friend, I told him to lock up but you know friends, some are telling him to keep pushing and try to convince the girl to leave his boyfriend for him.
I concluded that I will bring this to you guys, maybe we can see a similar situation.