<human>: Provide a brief overview of the text.

I woke up this morning to a voice mail from my boyfriend of 8 months. He was driving home from work (a 24 hour on call shift) and was singing/chanting her name a couple of times. 

I called him back immediately to ask him what that was about and he was extremely sorry. He said it was a habit that he struggled to break since dating her. Apparently he likes to repeat things, especially when he's tired. He says he's been doing it for a long time and that he chants both our names, which doesn't make things any better. 

It's especially hard for me to be okay with it since they only dated for 3 months and they broke up a year and a half ago. It makes me feel like he's not over her. He sounded genuinely sorry and told me repeatedly that he loves me and only me and that he has no intentions of getting back with her. 

I'm trying to be understanding because I know he's not cheating and he did have a super long day at work. But still it hurts and the relationship doesn't feel the same anymore. 

Am I overreacting ? What should I do?
<bot>: my boyfriend left me a voice mail of him chanting/singing his ex's name over and over again when he was driving home from work.