Can physical exertion during foreplay make it difficult to get hard?

I have been trying to figure out why every time my pants come down i cant manage to get hard when i am with my girl.

I have tried to explore whether its psychological, cutting out masturbating, eating better, but it doesn’t seem to work.

I have been raging hard in front of her before, just every time she goes for my pants im soft.

One working theory i have at the moment is physical exertion, during foreplay. I’ll usually finger her rather intensively, ill feel the fatigue in my arm, and in the moment im severely focused on reading her and pleasuring her.

I have noticed the moments before i finger her, i am hard, but after im done with her and its my turn, im soft and cant get up.

So could it be the shift in mind set from me to her, plus physical exerting myself, could be the cause for why its hard for me to get it up after?

How probably do you think this theory is?