Why would he backflip on me meeting her?

My best guy friend wanted me to meet the girl he’s been seeing. I said I didn’t want to but he pushed the issues and pleaded for me to meet her. I caved and said Fien, then when the day came to meet her he backflipped and said boss not the right time because he doesn’t know how he feels about this situation anymore. I asked him what he meant but he just went silent and said he doesn’t know what he wants anymore. We have a very close relationship and he said she’s jealous of the relationship with have together and is confused about our situations My best friend tells me he loves me and we fight like an old married couple and recently he’s said he’s overwhelmed by his emotions. I feel so confused because it feels like he’s feelings for me have shifted from just friends and he’s just coming to realise it?

Why would he backflip on me meeting her?
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