When is it a relationship?

First, I'm sorry if this is a dumb question but me and the guy I talk to are both people with ADD. I am great at expressing my feelings verbally but he is not. he shows his feelings through acts of service. he does sweet and considerate things for me to share his feelings. like giving me his food, letting me get in front of him in line, checking on me when my mental health isn't good (he observes me, I don't tell him), accepting me fully, etc it's very sweet but how would we move beyond where we are, like into a relationship? he does pretty okay with speaking, I'm just not sure if he would ask me to be in a relationship with him or not. he stutters sometimes when he talks to me due to anxiety. and I was told the guy always brings it up. he showed interest first but I slid him my number to help him out lolll