I am studying the relationship between burnout on GPA.

I wrote down my hypothesis as follows:

H1: Exhaustion will negatively affect GPA

H2: Distance will negatively affect GPA

H3: Competence will positively affect GPA

However, I have also two control variables and now I have conducted a Hierachical regression. However, I have the feeling I have to do 3 simple lineair regression, or is it no problem that I have conducted a multiple regrssion? , my supervisor wanted that, namely. I really don't understand the differnce between one or the other model. Could someone explain which how I have to state my hypothesis?