He knows all your insecurities. Take things one step further if your very best friend appears to enjoy your one-on-one time collectively.
Liana. i'm very intelligent and well-mannered, but also very open-minded and always ready for new experience, full of fantasy. i'll be perfect companion for any occasion, even its social or sport event, sightseeng tour, business trip, exotic vacation or just an excitiong and passionate night in your or mine place, you'll never forget a minute with me! i'm available in bucharest and most towns in europe with appointment. feel free to contact me for appointment. see you!
While the possibility of losing your friend may seem like the most obvious risk, you should also consider that what you used to be able to talk to your friend about, you may not be able to talk to your partner about now that they're not just your friend.