"Giving back to others shows your good heart and integrity, and although they may not consciously think that far in the future, men are subconsciously assessing maternal traits in a woman to see what kind of mother she'd be," Kelman says.
No need to sign up at the homeless shelter only to impress him.
For example, if you'd like him to meet your parents, ask if he'd be up for going out to dinner with them, but let him know there's no harm if he's not quite ready for that yet.
Above all, keep the tone light and maintain open lines of communication.
If you feel confident at this point that you want things to be serious, go ahead and tell him, Trespicio says.
Check out a craft beer festival, see a local band at some hole-in-the-wall, or challenge him to a mountain bike race.
Little things in your everyday life, from buying coffee for the woman in line behind you to walking your neighbor's dog, count too.
Make an effort to do these things on a regular basis, but also make sure you're showing your selfless side when you're with him.
But if he still doesn't respond when you bring it up again, it may be time to rethink the relationship.
"You have to decide which you want more: a guy who's committed or this guy, even if he won't ever be," Trespicio says.
"If he suggests seeing the Georgia O'Keefe exhibit because he remembers you like her art, that's a sure sign of romance," Trespicio says.