I don't know how to feel

I met this guy like 3 weeks ago and he's like the sexiest guy I've ever talked to and he liked me but the thing is that he got a gf so i was like oh wow there goes my chances. Even though he has a gf we still had a vibe and i sent sexy videos (like the idiot i am) and he did the same but more revealing like full on nudes 😅.

Fast forward.....

i met his gf in a group and got her to save my number so i can see her status (this on on a app called WhatsApp).

Fast forward more......

He visiting his gf for the Christmas and i was watching statuses and saw his girlfriend's and i saw that he gave her a promise ring and shit and they post a lot of videos together and now I don't know how to feel because i told him i liked him and he definitely flirted back with me and even said that if he wasn't with his gf he would be with me. I definitely don't think that he would break up with his gf to be with me but I just feel some type of way about the situation and i need feedback