<human>: Hey girls of Reddit,

Jesus, I don't understand. My gf gets really really strange during her period. She doesn't get super irritated or angry like most girls seem to, but instead gets really...Well JUST CONFUSING. Like she goes really cold and unloving toward me, then gets really super excited at something that's not a big deal and then gets happy and then goes dead silent like a brick wall again and 5 mins later is screaming LOVE ME and I JUST CAN'T KEEP UP. Like she just shuts down and doesn't tell me anything about how she's feeling or anything so I am left in a permanent state of confusion. Why is it like this? Do any of you do this? Should I just shrug it off as crazy hormones? I'm scared of doing that because I don't want to NOT care how she's feeling. What's the best way to deal with this, because I'm beginning to get really really frustrated since I'm trying to get a sensical emotional response but it's like she's gone insane and it's freaking me out a bit because I have no idea what to make of it. I guess I'm asking you to give me insight into how exactly a period does this to someone who is usually quite level headed. Insight from the other side would be greatly appreciated. Thanks!

Give me a shortened version of the text
<bot>: gf goes mentally strange during period week and it's very frustrating and I'd like it explained from the other side.