<human>: Condense the text into a few key points

So I've been dating my GF for 3 years now and we have lived together for one full year and everything has been great until she brought up the fact that she is bored with her life because of the repetition and she wants to meet new people, but she doesn't want to break up.

In my pov I thought she was trying to break up but whenever I bring it up she says she still loves me and doesn't want to break up. Its very confusing to me and I don't really know what to do.

For me I love this girl with all of my heart and I don't want to lose her but I also do not want to get cheated on or hurt. I don't want to break up with her because I am happy with her but I also want her to be happy and if she isn't happy with me then idk what to do. 

She says she feels like her life is boring because she doesn't get to experience her age. But I don't understand where this is coming from because even though we live together we also party, a lot, more than some of our friends that are single. 

My biggest concern at the moment is that she is getting really close with a classmate and they "study" a lot and I've also noticed that the days she goes to the class that he is in she dresses better and looks more happy. She has assured me that nothing is going on between them but I can't help but feel like there is because she is acting very different.

I don't want to spy on her or anything like that but I do want to know the truth so I can either be happy with her or move on and make myself happy. 

Any suggestions on how to talk to her about this?????? Anything helps!!
<bot>: Think GF is cheating with Classmate, don't want to spy want to know how to talk to her about it.