Let's say u got gf or wife already, when u working with amoi kolik, how do u control ur feeling and avoid develop any lub lub feeling towards her?

Everyday u work, u see her. She always cute smile at u. Sometimes lunch together, maybe opposite same table, u see her eat, she see u eat. When meeting, u back her up, she back u up in front of boss. Team bonding ktv time, u two duet love songs. People call u, office couple.

How u control Ur feeling so u do not cross the boundary, or maybe u don't care at all? Just let ur feeling control u, and u go beyond normal colleague relationship?