If you invest your 100% of what would have been your half of the capital, you'll get the exact sameprodit as if you both had invested and you shared the profit. You could have easily bought with the amount you had and held for as long as you would have planned to.

Secondly you never compel someone else to invest in anything. You're putting unnecessary risk on yourself as you'll take the blame if that investment goes south. Only give them information that can help them make up their mind on their own.

Thirdly, you still have the opportunity to take a risk now. Bitcoin still has a way to go in this bull run.