<p>Bessel beams, known for their self-healing and non-diffracting properties, have distinctive phase behavior, especially the Gouy phase, which is critical for beam focusing and wave propagation. In this work, we generated a Bessel beam using a liquid crystal on silicon spatial light modulator and examined the evolution of the Gouy phase shift due to propagation through the self-interferometry technique. This method makes it easier to explore the Gouy phase shift without the requisite collinear alignment and to discard the phase-instability issues for an external interferometric setup. Our findings provide insights into the Gouy phase behavior in Bessel beams, which is valuable for beam-shaping applications where phase control is crucial.</p>