Family & Friends

Friend liked me but I didn't know and now he is with someone he shouldn't be with?

My friend and I are really close. So close that people often assumed we liked each other, but since he never asked me out, I figured people were mistaken. To make a long story short, I am super oblivious when it comes to guys. All my friends were guys from middle through high school, so I can't tell when they are actually into me. Well apparently my friend did have feelings for me and he thought I didn't reciprocate. He had told me, "It's nice to have a platonic female friend" and I had said, "Yeah, due to (a bunch) of reasons, it might not work out between us anyway." I was just going along with the conversation, not really thinking to much into anything. Well a week (literally) later, he texted me that he has a girlfriend suddenly. At first I was excited for him, but when I started asking about her, it was like pulling teeth.
"Where did you meet her?"
"at a bar"
"What's she like"
"She's cool"
"Do you have a picture?
"No, but here's her Instagram."
Now our friends are telling me that he DID like me and was using the platonic friend thing to see if I would disagree. If he had just told me how he felt, I would have gone out with him. It doesn't seem like he is happy in his current relationship. He never talks about her and when he does, he's super short about it. They rarely take pictures together, and when they do they are always with other people and far from each other. I feel horrible and sad because I actually do like him. I am just unaware sometimes.
Is there a way to fix this? I want to tell him soooo bad but I know it might make things worse. What should I do?

Friend liked me but I didn't know and now he is with someone he shouldn't be with?
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