Yes....might be hard, but it might be for the best....depends on the situation...
For me yes,because if you really love someone you can let them go if where she/he will be happy...its not really easy to do that but thats the only wAY also for you to move on and start with a new life without him/her...and if you really love that person you will be happy if she/he is happy even if he/she is with the other person she/he really love...love is like a game,sometimes you win but sometimes you lost but you need to accept it