How about;
To be honest w you, the last girl I met was a total stalker and wound up messaging everyone on my fb trying to say we were in love and all sorts of stuff. Told my mom we were getting married! Anyway, I'm pretty cautious myself now, I'd appreciate it if you could understand. If not, I'm sure you'll find another secret agent someday.
Or something along this template?
To be honest w you, the last girl I met was a total stalker and wound up messaging everyone on my fb trying to say we were in love and all sorts of stuff. Told my mom we were getting married! Anyway, I'm pretty cautious myself now, I'd appreciate it if you could understand. If not, I'm sure you'll find another secret agent someday.
Or something along this template?