Best friend dating my sister
I'm afraid that if I mess up, I will lose a great person and a great relationship of years with her.
At first I was fine, but then I started to gain feelings, so I stopped it.
We've been on and off until I stopped it last year.
Then this past November I decided to give it a try again.
If you do decide you really are interested in dating Eric, then you need to come clean to your friend.
If she loves you and can tell you really do care about her brother, I would hope she'd be supportive, even though it might be hard for her to get used to.