This has always been an issue, Friends don't really support your business like its theirs... 
There's always this holding back at some point, Its not Jealousy per say but, they just feel this " he will be better than me" syndrome... Its kinda normal to some extent though... But I feel business is enjoyed more with distant people than your friends, some even feel they shouldn't be paying for some services because you are friends... To avoid these things, just define ur business and your friends early enough, what's your take?...
Select friends wisely. Friends are important, but also your business is important. You might want to read my article on values @romchuks
https://steemit.com/personaldevelopment/@kozan/the-power-of-values-in-personal-development
Friends can help in business but depends on the quality of your friends. Finding good business people and having them as friends may work better.
I think it depends on the values though.
Create a great day,
@kozan