Does any guy have a clue on why my ex wants to take pictures of me so bad?

2 years ago my ex picked up photography and now has fallen in love with it. Since then he's landed offers for photographing homes, won photo landscape competitions, and done several photo shoots with other models and photographers who help him shoot better pictures
Since the beginning of last year, he's been asking me to let him shoot pictures of me. 2 weeks ago he bought some new equipment and he wants me to help him set up and do practice shots. This is the 3rd time he already asked me this year. Im very skeptical about the whole thing anyway because he's trying to set it up at his house first and last week he took me home, he squeezed my face cheeks for no reason and im taking it as a sign that he feels some type of way because doing that was unnecessary.
Does any guy have a clue on why my ex wants to take pictures of me so bad?
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