So, I've been seeing this guy for about 8 months now. BTW He is younger!

We really haven't had any drama, except for some trust issues here and there but we talk it out and get over it. This guy is my ex's friend. Now they aren't super duper close but they'll hang out from time to time. One of the reasons I would get mad at him was because he didn't want to talk to my ex about us or just out of the blue go public And f*** what other ppl say. You know it made me feel like he was hiding me. Well I got over asking him to go public with me and stuff. So lately we have gotten closer and last week he introduced me to his co workers as his GIRLFRIEND. After me just thinking we were still friends it was nice to hear that. I'm scared to ask him what we are because I don't wanna hear that I'm not his GF but hearing it would make me happy. Some clarification! Should I ask or leave as is? I don't think he wants to confront me about being his gf either because I'm only the 3rd girl he has been with. hellllp