I tell you, "go tell her"

The bad part for not showing your love is the possibility that...He may marry somegirl who is amazing, and she’s not you. 

I dont know why love’d rather be left unspoken, how bad things or good things will come following this decision. You may lose her/him.You will have to accept that she will be someone’s love. And also bad thing is she may never knew abot your feeling. Why dont you wonder if she also feels the same way with you, she may love you too, but she thinks you dont feel the same. How tragic it will become. Two people who fall to each other but cant be together because of untold feeling. Because sometimes, love someone who doesnt love you back is such a damn really bad thing. It could be so desperating, frustating. Being unloved is the most unwanted thing to be in the world. Everyone should believe that there is someone who will love her back. Accept her with her own self. Love things she hate about her self. Make her feels worthy no matter how she feels bad about her self. Someone who never give up on her. Have her back. Guide her to find path on her vision. Never be bad to her. Just do the good things, together. Be a happiest couple with no worry about breaking up. Have no bad thought because they have faith on each other. Stand by each other and tell “no matter how hard it will became, i believe we can go through it all, we are a partner, a team, noone can join or separate us.”