My boyfriend has been drunk texting his ex. Any advice?

Anonymous
I found out that my boyfriend drunk text his ex on Christmas eve and valentines weekend. She texts him every now and then and they have really long conversations. As far as I know they have never met up but I know he's been sending her selfies of him at 4 in the morning and suring their conversations.
I dont understand, I've been with him a little longer than she was.
Does he still like her, we got together 5 weeks after they broke up.

(and yes... I looked at his phone as I was suspicious)

Thanks
My boyfriend has been drunk texting his ex. Any advice?
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