Girlz ply answer this..........?

i love a grl .we r friend since i was in 7th grade (now im in 12th) . i fell in love wd this grl whn i was in10th . in +1 i had changed my institute and fortunately she came in same institute .She asked my number after 1 month but after 5-6 months we had stopped talking cause i didn't give attention to her . on her birthday i wished her and she replied 'thanks' .After that i start sending her sms. now we just talk on phone(7 times since then) . we had a friend(guy) in common .she mentioned abt him 2 times in our conversation . wht do u think a guy who had stopped talking to a grl and then he wished on her brthdy shows he likes her or its just a common thng.its been just one month since we start talkin' .These days i can't concentrate in my study. Should i call her daily ??? . i think it wld be weired. plz tell me wht should i do