how we know that we in love?

suddenly, i don't know how feel to be in love with someone . tiba tiba rasa kosong je hati ni hm people said you will remind someone that you love once you wake up from your bed tapi sometimes i don't even remember him. tiba tiba dia ws and i will be like "oh dia ws wish morning" . how my pure heart suddenly became a cold hearted one. i asked my mum, how do you know if you love someone? "you want to be with him all time, want to married him, want to have child with him". but how could i don't even have that feelings.

sometimes it's not we don't want to love that person anymore, but suddenly that feelings disappear

 i don't know if after him go, i will still in love with anyone anymore. maybe because 'that' person, i don't believe anymore about true love. if you want to ask, didn't i feel guilty make him like this ? my answer is of course i feel guilty. i feel guilty as hell. but it's not that i want it to be this way. who want to hurt someone that love you so much. i don't know anymore. i feel so hopeless right now.