I met her 1 year ago, we studied same class at University=she then had bf, so couldn't do much cause they were all the time together.

Now she is studying again with me, but single. I started everything from begining like I just met her for first time, from body language, negging, then giving a bit of IOI and won her confidence + she stated clearly how she likes how I know what I want etc and yet still this started coming on her Facebook.

Only like since 4 weeks ago some guy who works with her started posting staff like songs on her FB wall, then writes on her new profile photo 1 week ago "Dayaaaaaaaaaam girl, we shld go on anther date soon xxxooxxo"
Furthermore today he posts a link of some clothes for girls and says her "Oh my god, you will look stunning in ths, u should buy it" and she replies with " This is why I love u, then she says she like his pet"... and then he writes "U could be the new model for it if they saw you in it xox. Also she commented on one on his photos how she "is in love with the photo" and he replied how "he is in love with her"...
And since last week I txted her few times something related to what we study and she ignered my texts..

Does it mean she slipped away and I fully lost her, or if not, how can I get her?

Mastering the game is not about being able to manipulate one person in specific and get her laid at any cost. It is rather about increasing your chances by having the right attitude and mindset, and one of those is the attitude of abundance. To put it short, just move on to the next girl. That other guy seems to have done a good job and earned what he deserves. If she is in love with him (and for as long as she is) there is no chance for anyone to get her. You can only wait until their relationship starts to crack, and that's a waste of time.

Damn she is hot + awesome personality, can't believe slipped away. Thanks anyway I guess I will have to move on...

From what it sounds, he's nothing more but a flamboyant facebook dunderhead. She will realize, or already does, that the guy is a complete joke and a waste of energy. Do not give up on her, though do not wait for a miracle, take her out on a casual date and put a end to this.

Yes actually that was my first impression too after I read what he wrote, I could not believe I lost to sombdy like that...
Btw she replied now to his comment of ""U could be the new model for it if they saw you in it xox." by her saying "U are too kind, cant wait for Friday".
I guess I will ask her out tomorrow as I have no time left.
Thanks

Does anybody have a different opinion though?

OP the very best thing you can do is to back-burner this woman and find and date several others. Keep contact with her on a purely friendly level and re-engage if the opportunity arises.

You're too invested in her right now and competing for her through Facebook is childish and lame. Go about your awesome, happy life and show her what she's missing out on.

Thanks for your opinion.