Eternal Regret

How am I to say. I am sorry to have let him go. I left him because I thought I could not love him how I love another that. But I was wrong. Now I realize that I love him very much. But he already has someone else now. And he's happy with her. I'm happy for him but at the same time I feel very sad. I can not forget him. I still have high hopes on him. I hope so he have the same feelings for me. But apparently it's all just hope that I will not be so true. He will love her so. Now I had to endure when you see him with her ​​and put on all this happened.