Is long distance relationship Haram or halal?

I have a long distance relationship with a Muslim girl. We usually message each other and meet once every one or two month. Just talking and eating together nothing else. I told her that I will not talk to her during Ramadan and will call her after Ramadan. What I want to know is Is our relationship permissible? Although I want to do Nikah with her, I can't afford financially now and Still in school with No work or Income. What Should I do in this situation?