Im wondering if i am in love?

well my first bf that i was with for almost 4 months dumped me not to long ago...but i havent stoped thinking abut him, he was the sweetest thing and so kind to me now that we broke up we instintly became enimeies..i went out with somone eles and i cud tell he was jealous so he found a way to break us up..and my stomach tunrs over and i feel sick and my face feels hot when i look at him or walk by him. and idk whuts wrong..me and him r talking now but i wanna tell him how i feel tomorow, but idk it for sure..is this love that im feeling? >>