How can i take the next step with this girl?

in the beginning of my sophomore year i became a closer friend with a girl on a trip we were joking around nd i walked off as i was mad she hugged me said i love u nd kissed me on dha cheek then i started talking to her nd like a few weeks later she did it again in the hall way and lately i feel that we dnt see eachother in school as much and i dnt text her as often. do you have anymore ideas to make texts last longer what i should say to her when i see her and give her signs that i like her but i wanna see if she likes me thnks