Jealous?

Is getting jealous childish?

Like getting upset that your bf is always talking about how cool a girl is?

Or getting jealous about him going to eat with a girl, go get starbucks with a girl?

Is that really being childish? Getting jealous over stuff like that? Im just hurt that is all. And i am a jealous person. Hes always telling me to grow up. But i find those to be reasonable reasons. Or am i wrong?