"有缘千里来相会" means if there exist the "缘分" between two people(man and woman),they will get together someday even if they are far away now and they don't know each other now.
Chinese believe that whether two people can get together is decide by "缘分".and the "缘分" may be decide by the god.In frief,if you two should get together you are sure to get together.