What to do about my girlfriend loosing interest?

Me and my girlfriend have been together for about 2 year and start dating in highschool as well. the only differance is that she still kisses me and we cuddle from time to time but it seems like the instigation to kiss always comes from my end lately. I feel like im always asking her to kiss me and cuddle with me. sometimes she also says to me when we lay in bed that she is just tired and rolls over. If I press the subject any further asking for just 5 mins of some cuddle time she seems to get mad and annoyed. I’ve sat down with her and had a heart to heart asking if there is anthing going on and to be honest about her feelings. she seems sinsery in telling me nothing has changed and she never wants to loose me but I get a feeling she might be holding on to false feelings if that makes any sense. We also argue a lot about stupid things that never matter atleast 4 times a day. I don’t know whats going on but I just want things to be back the way they were when we were crazy about eachother and could just sit around all day and have a blast. also if this factors in at all we do have sex and have been having sex. the sex is still good and atleast 1 a week but definatly doesnt feel like it used tomore of a going through the motions then physical attraction. sorry for my scatter brain thoughts btw.

Any suggestions or advice would be awsome, thanks and I feel you man!