Most Helpful Guy
>> I don't want anything that deals with sex please
That tends to cover the bulk of it since that's one of the things you two can exclusively do that he can't do with a female friend, e. g.
But emotional support might be one. If you can be really supportive of him when he's stressed out, and also give him space if he just needs some privacy, that can help.
Letting him have a healthy dose of independence away from you to go out from time to time without you can be something he might not ask for out of fear of you thinking he's not interested in you, but most guys would want a healthy dose of that.
And taking mutual interest in things he's interested in (whatever it is, but might be an activity more popular with males) might also be something that helps you two enjoy your time together that he wouldn't necessarily ask you to do.2
Most Helpful Girl
Loyalty and admiration.1