Any advice for my girl problem?

So, theres this girl that i really like, and shes told me a lot that likes me too, but the thing is that i know sometimes she plays around with other girls and says she likes them when she really doesn'tt. And i worry thats whats shes doing to me.....cuz im not exactly the prettiest person.....and i asked her and she said she really did like me. i want to trust her but im not sure if i can. Any advice?Any advice for my girl problem?
just take it one day at a time. get to know her better, then form an opinion. good luck!

beauty