We had a recent thread here about sharing info about other lovers with one's SO.
Different people have different experiences and desires. For myself and my gf, my primary, we feel least jealous when we share quite a bit about our dates with others. I've only had one other lover in 2 1/2 years asking me to not share info about him with others. And he didnt ask me not to talk about him to my gf, just to other mutual friends in the local kink/poly scene. He is admittedly a very private person.
Your gf might actually feel more comfortable down the line, if and when you get another lover, knowing more about your dates than she think she would be right now.
Love withers under constraint; its very essence is liberty. It is compatible neither with envy, jealousy or fear. It is there most pure, perfect and unlimited when its votaries live in confidence, equality and unreserve. -- Shelley
Mags (poly, F, 60) loving miss pixi (poly, F, 38) since January 2009, living together since 2013
also loving Punk (monogamish, former swinger, 42, M) since Oct 2015
"Master," (mono, 34), miss pixi's Dom for 2 years