- He's talked about you to his new girl (so she'd know who to text)
- He might find these texts on her phone if he checks it.
- He might be the one who sent them (extreme, but possible)
- She either went through his phone to get your number or looked you up online (if it's possible to find a person's cell phone number over the internet where you live). If she went through his phone, then this can happen again in 2, 5 or 10 years by another new girl.
It'd be a good idea to change phone number. You don't need to be reminded of him after what you've been through.
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