Why would a guy get angry if a girl unfriended him?

I’m curious and would like opinions- I have been friends with a guy after meeting at college for about 5 years. Wed talk on and off but then he got engaged and I had feelings for him so I had to unfriend him.
He then sent me a message all annoyed and then later apologised….. I don’t get why he got so angry BUT he knew how I felt but he claimed he didn’t feel the same at the time.

I remember the time we talked before this I mentioned my ex to him and he said something like ‘well he wasn’t the guy for you’…it’s almost as if he felt something for me but didn’t admit it.

What do you think, any opinions?

Why would a guy get angry if a girl unfriended him?
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