Since humans cannot perceive infinity? - Why not? Infinity is simple, it means forever, not a difficult concept.

Actual time is a constant - Time dilation is the effect gravity has on devices that measure time - devices are matter - gravity only effects matter. By taking in the effect of gravity on devices we get more accurate GPS readings.

Time dilation is the effect gravity has on devices that measure time - gravity effects matter, it has no effect on actual time.

The Universe is infinite time, space and matter. Meaning that space extends forever and the Universe has always been here - it had no beginning - and there will be no end.
Gravity is created by matter and it only effects matter - it has no effect on space or time.
Time is a constant - it does not / can not, slow or stop.