Should i still be interested in her?

So I went to Mexico for vacation and met a lot a of girls but one really stood out for me and We hung out when ever she could. I Met her at dances and talked about our lifes we had and had a really good time. But now I have returned to the USA and have stayed In touch by calling her about 2x a month for 6 months now, but now the last time I called her she told me she has a boyfriend. What should I do? Keep on calling her? I knew it wouldn't turn out to be boyfriend and girlfriend for both of us because of our long distance but I at least called her and I want to go back to Mexico to talk her and hang out but I don't know when I will go to Mexico. So should i still call her and still be innterested?