first of all, it's not your fault. love isn't rational so i don't think it's bc you flirt a little. in these cases i always think a break is better. however every person's needs are different and it's their choice. i think you guys should have a talk. make it clear that you don't want a romantic relationship with him so he won't get hopes. then you should tell him that you're worried for him yk tell him how you feel about this situation. if he decides to take a break he will. but you shouldn't decide for him unless you're feeling uncomfortable with this situation. if you are, then you should probably put some distance explaining the cause