My girlfriend isn't nice and is cold randomly?

I can't take it. I feel like "WHAT THE ****?!?!?!" sometimes. During the day she'll be so lovey dovey with me, then randomly she'll snap out of it and be all cold and "buddy buddy" with me. I'll throw in a "baby" and she'll be like "sup". I know this isn't PMS because its tered randomly throughout the day. I just love loving on her and understanding her, but she just doesn't recognize the **** she puts me through emotionally. It bothers me. It's so intense on one side. Like, so intensely "not interested" then so intensely "lets get it on". I guess that's just how she is. She hates it when I say anything like "whats your deal?". I think she's just busy or something when she's acting like that, but who acts like that to someone that loves you? I'm not a pushover, its just I would like to get some loving feedback and not just ******* girl's and their emotional roller coaster minds. I just wish they didn't have to be like this