Clearly she has become interested in another male.
That's all there is to it, it's always the reason women lose interest for no reason.
There's a couple of strategies, but their success rate is low to non-existent.
Basically the strategies are variations on pretend she doesn't exist.
Ignore the people advising you to text her, texting is the worst possible thing you can do because it can't convety articulate feelings, empathy or whatever and is open to mis-interpretation. When someone doesn't give a shit about you (which will be the case) and they receive an emotion based text, they will look on it negatively.
UNLESS!!!!
You turn that emotion into emotion about something they are interested in that is material, or an event or something like that. - it can't be about them personally.
I would recommend against that though, because there's a very high risk that you will say the wrong thing because your pussy whipped and pining over her like a litte pussy boy and will be speaking from a damaged emotion perspective, very likely to come over needy and desperate.
...We've all been there ;)
...So just ignore the bitch and bide your time like a stalker in the bushes does.
