concerned

[Stressed63]

I have an 18 year old daughter who has been daiting since she was 14 and started sexual relations when she was almost 16.She  had sex with her boyfriend at the time so I requested she go to the clinic and be responsible and get on the pill and get info on std's and all.When she broke up with this boy she did it to go out with this other young boy who was very nice and they dated for almost 2 years but she just left him for another boy who is still younger than her!!My concern is that I see that she can't be without having a boyfriend she stops dating on to start dating another,Is there reason for me to be concerned?You might be wondering if I communicate with? I do but when she wants.She is going to college and living at home.She wants her freedom like her other college friends but like I said she lives at home and we cant let her run around like crazy. from what I know she does not drink alcohol or do drugs.She seems to be doing alright with college but I don't understand theneed to be hanging out with highschool girls and boys and to be wanting to leave her boyfriend of almost 2 yrs. which he is a senior at th hgh school and try to date a junior guy in the same high school? Should I have see someone or can you tell me what to do.I don't want to nag her about it because she will just shut down and not let me know anything that is going on in her life. Although now i'm finding out things because I go into her my space and facebook and snoop around.Please tell me what to do.My relation with my mother wasn't very open but because she never felt confteble talking about sedx with me when I was young, that is why when I found out about my daughter being sexually active I talked to her and guided her wich way to go for gettting the pill and more info. I desperatly await your resnse.