Why would an ex boyfriend not respond to a message of his ex girlfriend recently but like a lot her pictures and follows on Instagram?

Anonymous
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He broke up with me since we didn’t have sex yet and we were together for almost 2 years. We had sex after he broke up with me. We would flirt and do sexual stuff with each other still. Until recently he hasn’t responded to my message. Even though we’re not friends on fb anymore, when I got an instagram, he followed me and likes a lot of my pictures.
Why would an ex boyfriend not respond to a message of his ex girlfriend recently but like a lot her pictures and follows on Instagram?
5 Opinion