Can love shift?

So i really liked this girl at work who encouraged me to join a gym with her. But her behaviour changed towards me so quickly. Its like we used to talk alot and she came to my office to talk with me. But now she ignores me after joining this gym with her. On the other hand there is another girl who works in my department. She is very likable and talks alot with me. She and I went out for dinner and then we were like good friends. I feel so stupid right now because i have feelings for her. But God damn it i never get loved back. So i need to stick with a term of friendship. I have been repeatedly suggested in my personal life my mom, my childhood friend and meditation teacher to stay away from girls.