Chat them up and see where they are at in life. Test the waters to see if they are interested in having the kind of relationship you want to have. If they aren't, which may very well be the case, then move on. Don't become hyper fixated on it or try to change their mind, just move on. Be intentional about the type of relationship you want to have, don't pretend to be a friend then push for more. You'll save yourself a lot of time and anguish if you're honest with yourself and honest with others.