Am I overreacting over my dead fiance?

My (33f) boyfriend (36m) is going nuts about my dead fiance. I have a child (3m) with my dead fiance (42m). He died 2 years ago. We were very happy. We just had our love baby. We co parented the other 3 children of my fiance with their mother. My fiance was a very lovable man. He was my endgame. He died suddenly at our home and when I found him there wasn't anything the medical team could do to save him.

We are 5 months together. My boyfriend hates that everybody still is stalking about my fiance. I consider my fiance's family still my family so I see them occasionally. When somebody says my son looks a lot like his father my boyfriend makes snarky comments under his breath. I'm not the one who's talking about my mourning. I just keep that for myself and my best friend. He just said that it's like smashing a cactus in his face. He can tolerate the cactus on the table, but not on his face. He says I'm overreacting about my dead fiance. But am I?