Is it normal for me to be feeling sad, angry at her, and jealous of other guys because my girlfriend of 8 months met new friends (who are guys) and is spending all her time with them rather than me?

We went from talking to each other all day everyday, and basically loving each other, I guess, to barely talking at all while she spends more and more time with people who I don't even know. She's changed as well; she doesn't talk to me like I'm her boyfriend anymore. She treats me like I'm just another one of her friends. It almost seems like she wants to get rid of me sometimes.

I've told her how I felt, and she reassured me that they were just friends and that she loved me. Most of the time the two of us are very close; she's almost uncomfortably clingy. She usually always asks what I'm doing, she always wants to know how I'm feeling, she's always talking to my family, she always tells me she loves me... she always had something to say to me. If I was rude, I'd say that she never shuts up, but to be honest I love her and I love the attention she gives me.

It's so confusing to me because it all started happening so quickly; it literally only took a day for this to start happening and it's been going on for about a week now. As soon as she met these people, I've become the second priority. I know that there isn't a possibility of physical infidelity, but she has been emotionally unfaithful to me (our relationship is long-distance) on more than one occasion. It's usually the same scenario; she meets new friends and spends more time with them, putting me on the back-burner. She always gets too emotionally invested in new friends, and when they end up failing to live up to her expectations, or they hurt her, I've always been there for her. Even although she neglected me to get close to them. She flirts with them, gives them intimate information, and basically just pours emotion into them rather than me. Since our relationship is long distance, this bothers me even more.

I know this problem pales in comparasin to the other problems people are facing on this board, but I'm a very inexperienced lover and I'd just like a little bit of support on how to deal with my emotions, or whether she is in the wrong and should not be acting this way. I'm a sensitive guy and little things like this really hurt me. Please don't poke fun; I realize that my problem is petty compared to the others here, but it's embarrassing for me to ask for help and I wouldn't be doing it unless I really thought I needed it.