Formal:
* Nilikuwa nikitafuta urafiki, si mapenzi. (This is the most direct translation and is suitable for formal situations.)
Informal:
* Nilikuwa nataka rafiki, si mpenzi. (This is a more casual way to say it.)
* Nilikuwa nahitaji marafiki, si mchumba. (This emphasizes the need for friendship over a romantic relationship.)
Emphasis on "not love":
* Sikuwa nataka mapenzi, nilitaka urafiki tu. (This directly highlights that you were not seeking love.)
The best translation will depend on the context and your desired level of formality.