Why didn’t he tell me he had a girlfriend?

So basically I met this guy at school, we started to get along and talk and spent a lot of time together, I came to my classes fully dressed up with my best makeup. I kept flirting and then asked for his instagram and he gave it to me, we then started connecting on there and he would like my stories etc as we got closer in real life as well. But out of no where like last week I heard him talk to his friends showing them his girlfriend. I feel disappointed but I still like him and I don’t know what to do, should I wait for him or is he not worth it since he is sneaky? I really like him and don’t want to let him go :/

Why didn’t he tell me he had a girlfriend?
Post Opinion