My (22f) boyfriend (24m) thinks my dad (58) is attractive

I am 22 years old, my boyfriend is 24 and my dad is 58.<br><br>My boyfriend and I have been together for two years and we are planning to get engaged soon, but this is a problem of a different kind.<br><br>My dad is 6 ft tall, weighs 80 kg and has six pack abs. He is stunningly handsome.<br><br>My boyfriend is also very handsomely built, but he is always jealous of my dad's physique.<br><br>He always compares himself to my dad and says that he is not yet as muscular as my dad.<br><br>As a result, he works out at the gym for 3-4 hours a day to get a physique like my dad's.<br><br>I don't understand why he is so obsessed with my dad's physique, I get it that he wants to be more muscular, but why is he so jealous of my dad's physique?<br><br>Also, this has become a problem for me as well. Because of this, he does not care about anything, eats very little at home and works out all day long. He also eats protein powder to get an athletic physique and has stopped eating rice, chicken and mutton. I sometimes feel that he is trying to prove to himself that he is more muscular than my dad, which I really dislike.<br><br>What should I do in this situation?