This is gonna be a bit long, so bear with me

I met this girl in school back in October. She wasn't drop dead gorgeous, in fact, I've been with girls that were more attractive, but something drew me to this girl physically.

I ran into her one night at a bar, and I started hitting on her. Before I knew it, I had a date solidified for the following week. I was ecstatic, because everything went according to the plan.

We go on the date, and we have everything in common. Music, movies, interests, travel experiences, sense of humor, wits, you name it; we connected on that level. I was blown away by what I landed on, and I felt more of a connection with this girl than any in the past (even the one's "I said I love you" to).

Fast forward, we go on like 5 more dates, and it gets better with each time, and it's reciprocal as far as I can tell. At this point, we've had sex about 3 times, and she insisted we take it slow since we go to school together (relatively small class since it's professional school). I agreed (genuinely).

The following week, we go home for winter break, and we talked intermittently while apart. The night before we get back to school, she tells me that being home made her realize that she's not over her ex (first time hearing about this, no obvious signs either), and she wanted to go back to being friends at school without it being weird. I was disappointed, but for some reason not crushed (not yet at least). I told her I was too interested in her romantically to be friends, but we could be amicable. She protested, but understood.

Over the next few days, it hit me fucking HARD. I had it in the palm of my hands, I had a taste, and then it disappeared faster than it even started. We went a month without talking, but then she started sending me snapchats, random texts, etc. So at this point I start to think she's over her ex and it's time to move back in. I hit her up one weekend to see if she's going to some class social event, and she says yes. I tell her I'll see her there (trying to gauge it at this point). We get there and she's talking to this other dude. Her friend tells me that she was sort of hooking up with this guy, but she's emotionaly distraught and ending it soon (see a pattern here?).

As I got fucking hammered that night, I found myself texting her in my drunken stupor, telling her she's weak for giving me some bullshit excuse especially when we have to see eachother all the time, and subsequently getting involved with another classmate. She drunkenly assured me that it was nothing and that we would talk in person, sober.

The next day she tells me she wants to talk after class. I agree, she comes over that night, and basically tells me that she knows what she did was wrong, but that she's trying to be alone, etc, and that she realized she's pulling these guys in and then pushing them away as soon as it gets a little heavy. I told her my stance remains the same, and that she should try to get better emotionally instead of continuing this bullshit. Before she leaves, she says that she thought I would have plenty more to say, and I responded that I'm not going to get on my knees and beg, and to let me know if she ever changes her mind. We haven't spoken since.

Here's where it gets to my question in the title

It's been weeks since that talk. I can't stop thinking about her. I've really given it my all to go out and talk to other girls. I've talked to girls that were more attractive, and to my dismay, I can't seem to be interested.

I know that this whole thing was VERY short-lived, and is disproportionate to how invested I am. I want to move on, I want to regain interest in other girls. I want to find someone better. Except, I just....can't. I know everyone is different when it comes to this type of stuff in terms of timeline, but I feel like this has been dragging on for far too long.

So guys, is this oneitis? Is this something different? Am I codependent? Help me make sense of this clusterfuck of a situation.