I've been hooking up with this girl since April. At the time I had a couple other fuck buddies but they weren't all that close, emotionally or location wise. She was a friend that just randomly started taking to me, pretty soon after I invited her out to the bar, took her back to my place and fucked her. We did this a couple times a week for the first month then she practically moved in, she spent the night like 5 days a week, we had sex every single day she she started doing girlfriend stuff like cooking me dinner, buying me stuff, she seemed completely obsessed with me. I stopped seeing the other girls because I was getting enough from her and I thought it might be a good LTR, I never directly asked about it or told her about the other girls but it kinda seemed implied that we were exclusive. I didn't act any different, still teased her, and didn't act really serious about it, I showed her a lot of affection but only in response to her doing the same. All was good then one day she leaves to go to work and doesn't come back over. I didn't even message her, stayed out of her business. I kinda kept in contact over text but didn't question her absence until she'd been gone for about a week. I'd invite her over, she would make an excuse why she couldn't, she was still messaging me a lot but I gave her less attention. After a couple weeks she came over and we fucked and everything seemed normal, then she did the same shit again, I caught her lying saying she wasn't going to be in town when she actually was and asked why she was lying to me. She said she's "not that comfortable with me anymore and didn't want to say it because she thought I'd be mad" so basically she just wants to be friends now, except not really because she pretty much straight up ignores me. I'm not trying to get back with her or anything, i'm just trying to wrap my head around what would cause a girl to go from obsessed and banging her every day to completely cold in a day with no warning signs. I know TRP advice is basically just fuck a lot of women, keep some around to hit up for sex whenever. That's cool and all but I prefer LTRs. I'm just trying to figure out where I fucked up so I can correct it.