How should I respond to not being my boyfriend’s preference?

Recently, my boyfriend and I got into an argument because I was showing him Pinterest hairstyles and he said he liked a hairstyle that looked exactly like his ex’s hair (the girl in the picture even looked like her). We got into an argument because it made me upset that he continually mentions that he likes that look and it looks nothing like me. In the past he commented on how she looks like a model and has told me to do that hairstyle which is almost impossible for me because it’s a very curly but I have straight-ish hair. Every time he talks about his type/preferences, it’s exactly what she looks like. The body type, hair, fashion, everything. But I look and dress nothing like that. And a part of me wishes I was his preference in some way even though I like the way I look. I know I’ll get criticized by comments for being insecure but I’m just curious on how to respond or how others feel about this type of situation.

How should I respond to not being my boyfriend’s preference?
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