Is it ok to love more than one person at a time?

Ok so here's the thing: I, for the past half year, have been on a hurricane of emotions. I liked this guy, which turned into love, but rejected me. *sad face* He happens to be the first boy to ever capture my heart. But now, there's this other guy, and I couldn't help but be smitten. But I still feel an attraction to the first guy. Which brings me to the question. Is this ok? Any advice? Have you guys felt this way before??? ¡Thank you in advance!