All people possibly experience love in life...sometimes true love and sometimes one-way love...
when we involve in one-way love, especially for long time, it may destroy our self confidence, we may love truly but our love may not return us any emotional feedback...we may feel that we aren't lovable...if we involve this situation for long time, it could bring some not good results for us...think that someone fall in love with us, he/she tries to show his/her love, but we might not believe it because of that we felt for long time we aren't lovable ...the if sometimes you can't get someone you love, maybe she/he has experienced one-way love and he/she isn't able to believe your love truly. Then maybe he/she needs time to accept your love, give him/her time ....