Why would my ex call me by my nickname he gave me?

Anonymous

My ex contacted me wishing me happy birthday I got mad bc he broke no contact after telling me to not contact him because he had a new girlfriend, we argued but at the end he reassured me and asked me “ Is it ok if I call you ally” the nickname he gave me when we were dating before he called me Alice then switched it up why would he do this?

Why would my ex call me by my nickname he gave me?
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