Search Results: being fake in a relationship

This girl was in my college since past two years, but, I gained interest in her recently when she started showing interest in me. She used to complement me about every small things. It was more of a flattery rather than complement. I started liking her and I too complemented her as much as possible without being fake.
She was an interesting person and nice to talk with. I tried to do some mild flirting with her, but she never responded to my flirting. Sometimes, she acted really wierd. For instance, once I asked her on WhatsApp if she is on facebook, and she said yes. When I asked her to add me as a Friend, she din't reply at all. I felt that I am being made fun of, so I started ignoring her. With the span of time (about 3 weeks), my interest in her faded.
Today, when I checked my Facebook account, I found that I have recieved a friend requst from her. I didn't respond to it yet, but I am really confused about what to do with it.
Should I
1. Accept her request... that would mean giving this relationship a chance, and being vulnerable to emotional damage.
2. Decline her request... that would make her piss off real bad, and she would never talk to me again.
3. Let the friend request rot in the notifications menu for eternity.
Please help me, I am really confused. :/

BTW, she is the kind of a girl who has the looks of a goddess, but is too insecure about her own self. All her selfies look amazing but she never shares them on social media because she thinks they are not that good.

So I knew this girl for 3 months. In the beginning she was totally into me and outright said she's looking for a long term thing right now. She's also done/said some stuff that suggests she was ONLY focused on me too

About half way into knowing her (month and a half) we finally met up and had a blast. it wasn't a "maybe she sorta likes me" i got all the usual positive signs of a girl being into me. At the end though i made a joke about her kissing me and she walked away to her house door (from my car) with a smile and joked with me that i drove pretty bad

Later that night she told me, on the phone, she doesn't wanna hang with me because she doesn't wanna develop feelings or get into a relationship while she works on getting better. She's an alcoholic, and according to AA, they shouldn't date for a year. Fair enough, i believed her.

Why did i believe her and not think its a rejection line? Its not like we had a crappy date and she used that to blow me off, she was definitely into me 100% and even asked me to hang out the next day (and also asked to come over my house some time). Plus as i said, she was into me for about 3 months

We ended up not working out cause she was just a drama causer a month later, but then it hit me... i put 2 and 2 together... she hung out with "A new guy" she's never met before recently. Not only that, i saw a week ago she's back on the dating site i met her on.

I'm totally confused. During my very last phone call with her i asked her "so was it an excuse? you telling me you dont wanna date right now and wanna stay single?" and she told me "im gonna lie and say it was so you f*ck off" (meaning she told the truth about wanting to stay single and not date)

What also confuses me (judge me later lmao) was that i made a fake account (when i saw she was back on the dating site) and asked her what she was looking for, mid convo, and she said "Friends to turn into something more"

I'm totally lost and confused. Did she play me?