How do you change thinking negativly about a relationship?

I stop thinking about the "relationship" and start thinking about the person that I love.

Love is blind death dumb and stupid.....

Wow, that is probably one of the most challenging questions I have seen in awhile.
Here is some questions I have for you...
1. Do you love your partner?
2. What negative thoughts might you be having?
and
3. What kind of effort/energy are you really willing to invest to change your negative thinking.

Place more emphasis on the warm feelings and do your best to accept the negatives. Realize that you more than likely have plenty of negative attributes as well. It's all give and take.

Every relationship has some positive n negative point....
Thinking positive completely depends on u...
Wat mostly people do is forget the good part which make them...n concentrate on tiny things...which is not important.
If u really care for someone small ajdustment cn be made without thinking...
Dnt think much on small issues...

I take it that you don't want to think negatively about this person. Which means they have some negative aspects to their character that you want to overlook, but you can't because those aspects are right there in your face.

That is sometimes called WARNING BELLS!
The way to stop thinking negatively in these situations is ---Walk the hell away!

Now if I'm wrong, and the person has postive aspects and no negative one's... simply focus on the positive. But I think if it were that easy, you wouldn't be asking this question.

Weigh the - against the + and see which one comes out on top.