<human>: Check the post history of this account for the original [story] 

Life moved on, I haven't seen my ex in about a month, and I have no idea what ever happened with her and Charles. I'm currently dating a girl I really like. I have no interest in re-initiating contact with my Ex, but I want to be tactful because she's roommates with a co-worker and I'll probably see her at social events. 

At this point my ex has sent me several text messages that I haven't answered. I don't know if these are just good natured texts, but I'm a bit suspicious because the timing has been bad. Once, she texted me when I was out to dinner. "Hey, I saw you were crashing [her neighborhood]!" I was on a date with my girlfriend. I don't know if she just saw my car parked on the street or if she saw us walking to dinner. I'll give her the benefit of the doubt and say she saw my car. Then today, about a week later, "Hey stranger! How are ya?"

At this point it's just an annoyance to have her keep popping back into my life. I don't have any ill will, but I also don't have any interest in being her friend or continuing to talk to her. How do I convey this tactfully without coming off as a dick since I have to work with her roommate and I'll probably have to see her at any social functions?

Can you provide a brief overview of the text?
<bot>: Ex keeps initiating contact even though I'm not responding. I have to be tactful because she's a co-worker's roommate. How do I politely ask her to stop texting me since radio-silence isn't working?