You're still making it all about you. Will you please grant me the privilege of having an equal part in our relationship? Or do you really mean you don't want someone else to put you through what I put you through?
If you're still taking full responsibility in saying you don't want to put someone through what we went through, then you need to invest more time in dealing with your god complex before you get involved with anyone again. The key word in any relationship is "we", and if you can't accept that whoever you're involved with is capable of making decisions independently of you and that not everything wrong in the relationship is your fault, then you're going to end up in the same situation again.
If you're really saying you don't want someone to put you through what I put you through, then the answer is simple: don't get involved with anyone like me. I'd advise you to avoid Slytherins in general, to be honest. You aren't cut out to deal with us, and I think deep down, you don't really trust or respect any of us.
If you want my honest opinion, you ought to find someone like Sirius. Sometimes I got the feeling you'd rather be shagging him than me anyway. The two of you were close and had more in common than you and I ever did, and the words "Daddy issues" have crossed my mind more than once.
What you need, Harry, is someone who is willing and able to overpower you, take you out of yourself, and make you give up control. You need someone you trust and respect enough to let go with, and you need someone who can make you forget your bone-headed belief that the entire world rests on your shoulders, if only for as long as it takes to make you come.
I wasn't that person. I don't know who is, but that's what I think you ought to be looking for.