Texting my boyfriend

So my boyfriend has a friend which is a girl and she texts him all the time ,first thing when she gets up during the day,at night when we are in bed together and they work together 😞 I ask him about it and he said its just jokes @ I'm being jealous and she means nothing,but it's every day all day,I think it's disrespectful because she knows about me and him for encouraging it😞don't know what to do💔