If youre interested in a girl who already has a boyfriend, you need to show her that you like her and that you would make a good boyfriend. Try telling her how you feel. Then, its up to her to make the next move and break up with her boyfriend so you can have a romantic relationship with her.
What to do if a girl you like is in a relationship?
Instead, just make casual small talk, ask her opinion about something, or talk to her about things going on in her life. Just paying attention to her will signal to her that you care about her. This will increase her feelings of friendliness towards you, even if shes in a romantic relationship.
Do u have crush on me?
A major sign that you have a crush is when your friends tell you that you talk about that specific person all the time. Be careful who you talk to about having a crush. Dont just go blabbing to any random friend about your crush. If you do that, someone might tell your crush and then you might get embarrassed.