Why does my boyfriend brings it up multiple times that his besy friend is expecting a baby?

Me (27) and my boyfriend (32) have been together for about 5 years and living together almost since the start. I still have not met all his friends though, due the pandemic/moving away/overall live stuff. There is one friend (not super close) now that he keeps mentioning a lot the past few weeks. This friend and his girlfriend are expecting a baby: they are the first out of all my boyfriends friends to become parents. My boyfriend told me a few weeks ago that his friend announced the pregnancy. Then today my boyfriend showed me the pictures of the ultrasounds.

Is that just my boyfriend being happy and excited for his friend becoming a father or is my boyfriend "testing the waters" to see how I will react?

Why does my boyfriend brings it up multiple times that his besy friend is expecting a baby?
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