Is it normal to think about my ex boyfriend?

hey..i am in very bad situation,,its been going on since 2 years..i was madly in love with someone ,things didn't went right between us..we were together for 5 years.As he was preparing for his entrance examination we talked once in a week.it was a long distance relationship..i was compromising since 3 years..it made me feel as if it was one sided love..finally he qualified IIT-JEE and i expected that now he would be giving me time which ofcourse was needed as we were far from each other,but then too the condition remained same..i am 3 years younger than him..he got new environment in college and then he was even more busier and there were lot many things that made me feel insecure but he never bothered..then i met another guy who cared for me,did everything that i was expecting from my boy..i liked his company,,i started spending too much time with him which now i realize i shouldn't have done.we both started liking each other.we got together..when i told my boyfriend about him.he started to regret and did all possible things to get me back...the boy i am with presently loves me alot...but that guy hasn't forgotten me yet.. he has realized his mistake..and it wasn't that he didn't loved me before..he is badly disturbed and now m really worried about him..i don know whom i want to be with..i care about both of them but it hasn't been a single day i havn't thought about my ex. please help me out! i really want to get out of this situation as fast as possible..am in 12th std,am not able to study because of all this..