Why are girls like this???

When girls get a boyfriend, their friends act jealous and stuff and are constantly like, omg why do you talk to your boyfriend so much? or, when they get a boyfriend and are constantly talking, texting, aim or w/e its okay for them to do it? like...last night i was with my friend and i have been dating my boyfriend for about 15 months now. she just started dating this guy 5 days ago. and has only known him for 2 weeks. well, while we were driving my phone buzzed and i asked her to check it for me. my boyfriend had left me 3 or 4 text messages within the hour. we go to the same college but are about 45 mins apart when were home for break. and my friend says, why does he text you so much geez? so i said, well bc were an hour apart and we miss each other. then she says, well my boyfriend is 2 hours away and i rarely see him. and im thinking...you guys JUST met lol. well later in the night she spends the night at my house and were watching titanic. i didnt text my boyfriend much bc i was spending time with her, and she spent the whole night on skype or aim talking to her boyfriend...WHY DO GIRLS DO THIS???