Husband's best mate flirts with me and my husband doesn't really put a stop to it, is that weird?

Ok, now my husband and his mate have been friends for about 3–4 years and they know each other before our marriage.He comes home occasionally and is an outgoing and friendly and must say, attractive person.

While me (27) and my Husband(29) are the family oriented type, from what I heard from my husband, his friend (28) is more of ladies man. Having said that, hes always been friendly and treats me well and I have had noo reason to complain.But on occasions I feel he takes up the conversation and we end up talking a lot while husband is staring into space or just interrupts in between and his friend isint particularly concerned about his comments as such.I dont have an issue speaking to his engaging friend, but I do wonder why my husband doesnt step up a bit more.I guess all ladies expect that.!.Is that weird?