What do I do?
Most Helpful Guy
If you talk to him you'll just hurt your self more
Most Helpful Girl
... But I'm in so much pain...
Why torture yourself, day after day here, dear, when you Know... He's dating someone else now?
You know that if you Continued to chat and chew with him, his Date Mate might very will nip it in the buddy bud and tell him he cannot have you as a side Dish... Friend or even Ex.
Don't put your poor heart through this sadness and madness. Slowly Begin a new Beguine of focusing on something new so you can More Easily start tearing you and your heart away from him and the life he has decided to lead and and with Whom he will ever Decide... Dating.
Good luck. x