second gf

am i fool?? im.so deeply.inlove with my bf. but the problem is ,he is already taken... we are workmates here in abroad... should i continue this? . it gives me so much pain. everytime the girl post her sweet messages for him.. while me? even pics. of us i cant.. haays i dont know what to do. pls. help... he is my happiness as well as my loneliness.... pls... im just loving him so much.😔