Losing my touch.

I'm currently friends with benefits with this chick. All is good, I've been courting her with a combination of cocky/funny and fun/unavailable. Lately however, either she got used to them, or I'm losing my touch.

It all started when she went to a sleep over with a friend (her friend had just got dumped bla bla bla, she needed a shoulder to cry on). After that she was all distant and cold with me. Short answers, not continuing with the conversation, etc... Now she shows only little interest towards me, avoiding meeting up, and is constantly adding guys on facebook. I don't mind losing her but if its avoidable I would prefer it.

Since I only see her on the weekends, most of our interactions are online, except for that rare week day on which we meet. So one day I am all over her, the next I'm unavailable. Not to give away the routine, I sometimes do 2 days of avoidance. She does complain that I'm not super nice often, claiming she really likes that version of me.

Anyone can suggest a better "routine"? Like when I should call her to meet up, etc... I feeling that I'm not a challenge anymore, please help me become one again.

NB: If I don't talk to her for atleast 2 days or not show her any attention, she goes crazy and awkward, and thinks that its over with us.

Haha thanks. Well I wouldn't mind a relationship. I don't know, she told me multiple times that she doesn't want a relationship herself.

No far from it. She tries to give out this alpha female vibe but is a complete and utter softy inside. She also tends to copy watch she sees on television, which she adores more than me apparently.

I don't know, maybe she did something bad at the sleep over. Maybe they went out with guys, or experimented with each other, or she wants a single life again. Well the least she could do is tell me so I could send her on her way.