Feeling insecure for a stupid reason

Idk why this should even bother me but it does. My boyfriend is older so I guess it may be due to his maturity. but he doesn’t seem to have a jealous bone in him.

Like he gives me complete access to his cellphone & other devices, but he isn’t interested in going through mine.

When I ask why he doesn’t want access he just says “If you wanted to cheat I couldn’t stop you anyway”

Idk why but makes me feel like he doesn’t care.. am I just overthinking it?