To still be in love with her if she has a boyftiend

***disclaimer***(the answerer is not exactly in his right mind so BEWARE!!!)

"tonight I told her I love but it won't change anything :S" what do you mean did she tell you it won't change anything? If she did, well, read on, (if she didn't read on still)

"why do I still love he and is there any chance" well, love's different for different people, for some it's a as far as i know, a happening, for some others it's just a habit they fall in love all the time
there's always a chance, but if you really love her, maybe you'll let her be, let her go, let her be happy (if she is with her current love life) the girl's not a possession (i might be being too insensitive to your feelings over here but my intention was not to hurt your feelings)
"or am I being desperate. I'm so confused :/" after my above crazy rant, maybe you have found the answer to this one

***disclaimer***(the answerer is not exactly in his right mind so BEWARE!!!)

You shouldn't have even told her you love her in the first place. She is TAKEN which means lay off. Move on. You do not have a chance with her.

^ my phone won't let me write the "he'll" word too .. I don't know why

And taking the chance of getting the he'll beat out of you

Give up and move on. Your only hurting yourself. And by chasing a taken women you making yourself look a bit creepy