I need love help desperately

Andrea
He told me that moments with me felt beautifully finite. That when he was with me everything was good and made sense. 
He said moments with her felt infinite. That half the time he loved her and half the time he hated her.
He told me that he had to figure out how he loved her (like a sister or more) before he could be serious about me. He chose her, knowing I wouldn't wait.
And I said I wouldn't wait. I don't want to be a consolation prize or the runner up. I want someone who'd choose me. But I also want him. We are like twins, we like all the same things and k ow what the others thinking. Long term we are a match made in heaven. So now what? 
Should I be his friend? Should I tell him that if he realizes it's me then I'll be there? Where is the line of self respect and deserving someone who chooses you- and patience, fighting for the right one?