Why is this man acting jealous?

Buggington93

I used to have a huge crush on an older Italian man (age difference between us is 12 years)

We flirted like crazy, and I always doubted that he liked me until recently.

I got into a relationship and the Italian dude presumed that he was a friend and not my boyfriend. In fact, he completely ignored him and barely spoke to me. He kept asking who he was and he seemed annoyed when I told him it was my boyfriend.
He was happy for me when he found out I was buying a house, but when he found out I was buying it with my boyfriend, his smile instantly disappeared and he became moody.
We got engaged and he didn’t even want to see the ring. He acted disinterested and said he would NOT come to the wedding.
Now, he always gives my partner dirty looks and never speaks to him.

Today, I asked him why he treats my partner like this. He basically lied and said he always says hello and that he “likes” my partner.

im very confused. Is he still into me?
my partner thinks he is obsessed with me.

Why is this man acting jealous?
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