Could this be a red flag?

Not really trans related, just felt mostly safe posting here.

Could it be a red flag if your partner is obsessed with you?

I love sending gym pictures to my (ftm)boyfriend because he cherishes every one of them and gets excited about them like hes a fan. I was never praised this much before in a relationship. For context, hes autistic, and he likes collecting and categorizing things. He puts all the pictures I send him into a folder on his phone and reviews them, scrolls through them often. I thought it was flattering and cute, but the other day I was talking to a friend about our relationship, and I wanted to mention this, but then I ended up not saying it. I thought about why I was embarrassed enough not to share and I came to this conclusion, that if I told someone, they'd look at me weird or find it freaky and over obsessive?

Anyone with a similar partner? If a friend told you this, would you be concerned, or am I overthinking it?