What does a guy mean when he says tbh I don't know why?

RedRoyalty
This guy & I were talking for a while then became a couple. We vibed good, hung out a lot, easy conversation & just a natural mutual chemistry. After 2 weeks he decided in his mind I was his lady (wasn't aware no verbal communication on that) after he slipped up in conversation that we were in fact together. He had me meet his mom, dad and cousin. (Sprung that on me as well) Everything was good. He kept telling me how different I was from the rest, how I've shown him nothing but loyalty & how I opened his eyes that after a bad experience good ones can follow. Also how thankful he too have me ETC... but then I don't know what happened. We talked on Monday morning he said his usual lovey dovey stuff, texted throughout the day and then that evening he stopped. Straight ignored me and when I asked him for clarity on Wednesday he said "TBH IDK" what the hell does that mean? We haven't talked since. He didn't delete me from any social media but I ended up doing so. Mutual friends have reached out & stated they're just as confused as I am & he won't talk about it with them.
What does a guy mean when he says tbh I don't know why?
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