Did evan groom casey?

I'm not trying to start a fight or anything here i'm just genuinely curious. Evan was 18 in the show while casey was 16, and she was 15 for the most part before turning 16 too, while if i'm not wrong evan was 18 the whole time because they didn't celebrate his birthday. (correct me if i'm wrong i may have forgotten) Also, he knew casey wasn't interested in dating, and also knew that casey was his sister's age, yet still chased after her? I really love evan though, i just haven't seen anyone point this out

edit: He was 18 when casey was 15, which was why i found it weird. The reason why i thought it was grooming was because evan chased casey even after knowing about the age gap since he knew her through her sister. And casey initially already said she didn't want to date but he still went to her house to try to 'change' her mind. I know grooming ≠ age gap!