Slept with my boyfriends brother before we even met

Okay, I am currently dating the most amazing guy ever but before we really knew each other, I slept with his brother. I thought that my boyfriend was away but I'm starting to feel like he isn't. I honestly don't know what to do or how to tell him because I don't want to lose him over something that happened in the past and that meant nothing. I feel so disgusted with myself

It says away but I meant aware

Hi. I think the best way if you can't forget this thing, you should tell him the truth. If you tell him the truth I am sure he will appreciate your honesty.You will lose your heavy burden. This is a hard decision but you'll be relieved.

I have decided to tell him. He is coming over this Friday so I figured I should tell him then, that way if he wants to leave he can.

Please, write me back on Friday about what happened. :)

So I ended up telling him and he said that he already knew. Everything between us is okay, and I feel a lot better. I just hope it stays that way.