what should I do...

So I'm not usually the jealous type. But recently my boyfriend of 5 months' ex started messaging him and telling him she misses him and thinks about him all the time.
 She also tells my best friend (who goes to her school) that she's been talking to him and he checks in on her. But she's also sleeping around with a ton of guys from the school 
 She says she misses him from the depths of her soul and texts him all the time. He usually makes fun of it but do you think that he may actually be into her again? I've never felt this way about anybody before. Please help 🙁
He sent me this screenshot of something she texted him. Should I be concerned? 

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