Should I give up? Or just keep trying?

So I like this girl and we just went to a pool party and we hung out like the whole party. 2 days later I text all my friends to see of they want to go to the movies. All of my friends texted back expect her and I know she saw my message because I saw her post on Facebook via iPhone… I've tried everything to try to get her interest in me but she just doesn't seem to even want to talk to me… Should I give up?

Just give up if a girl doesn't respond means she doesn't like you don't be that creepy annoying guy who always messages her. Maybe send her one more message see if she responds then give up

Don't give up but don't keep trying. What i mean by that is try to show her like your not interested in her anymore. And if she misses you she's going to look for you

It could be that she hasn't replied because she can't come, and she feels as though that if she says no to your invite, you'll think that she doesn't like you. That, or it could be as you say. If you truly like this girl, I don't suggest you give up. If everyone gave up on their crush, then the world would be over-populated with singles.

Try a new method of getting her attention. It depends on the type of girl she is. You should know what she likes. If she likes romance, try giving her a nice poem or something. Maybe she just wants you to ask her personally. In my opinion, I prefer guys who are willing to confront the female at hand. But it really depends on what she likes, if she has a favourite animal, give her something related to that (I personally like penguins, as you can see from my username).