I feel he needs acceptance and love for who he is however flawed.
He may need to feel this way about himself.
It would not help him to rely on someone else feeling this way about him. This would be codependency.
I’m not sure how the lack of connection relates to the googling or the snooping TBH.
Are you trying to say that it is the reason you were snooping?
If you snoop then you undermine his ability to feel safe TBH so have likely made the problem worse.
Also, I think how you look and dress is almost completely unimportant/irrelevant. Be careful you aren’t too focused on things that are transient and superficial as the intimacy will suffer.
If the problem is intimacy, you perhaps struggle with some elements of that because of your aspergers and he perhaps struggles because of his childhood, then both of you address the barriers to intimacy that you have as individuals and try to bring the focus away from superficial things like hair, nails and clothes and onto things like laughing together and having fun.
You don’t have to like your bro’s ex but it has absolutely zero to do with whether he finds her attractive or not.
FWIW I would not want to be with a man who used porn even occasionally or who was googling for naked pics of people he knows - the latter is really creepy and fucked up and the former is just that I have moral objections to the sex industry.