Goovaerts,

read the I2C spec, and understand what needs to be done before
attempting to implement it.

If you do that, you'll be able to work out how
other people's I2C code works.

>       RELEASEBUS

its not an instruction, it is a macro to release the bus.

The I2C spec requires 4.7 us between signal events.
This is so short you can make do with
        goto    $+1     ; 2us nop!
        goto    $+1     ; 2us nop!
on a 4MHz PIC.

> Clock stretching

Is in the spec. Thus obligatory.
It's not hard to do, so why deliberately make your code non-spec.
Do it properly, and you'll never worry about whether
doing it wrong is causing your bug.

I already posted you some working commented code snippets.
If that didn't get you working, what will?