You're not in your own timeline. Gabriel isn't the man you think he is. I understand that terrible things happened to you, but he's too good a person to let him think that it was his fault.
So, stop hurting him.
You were pulled here by forces called the Powers That Be. If you know Mohinder Suresh, then you're from my own world. But likely not my timeline. Not if Sylar was calling himself Gabriel again.