Why would my guy friend get affected of my problems?

In the past, when I just recently reconnected with a guy friend, whenever I share my problems to him, he doesn't get that affected.

However, as of late, when I share my problems, he really gets affected and gets mad at whoever hurts me. Sometimes to the point of convincing or manipulating me to his way of thinking.

I told him to chill out but it's clear he really gets mad. Why does he get mad?

Also, he is very open with me. He tells me he wanted to say he was busy to someone who asked him out for a date but out of respect because it was also a friend, he went but when I teased him, he said he didn't like the friend. So I was saying why did you go out with her in the first place? That's leading her on. And he got upset again at me. Lol

I don't know if there's anything there but most of the time we prioritize each other rather than our dates and I find myself comparing him to my other dates.

He does invite me for a video call often and usually it is for me to vent out my problems but again he gets mad at me cause it seems my problems affect him. I told him hey these are just my problems why are you mad?

Why would my guy friend get affected of my problems?
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