Will these things pass since ex walked out or are they here to stay in the circumstances?

[Detah]

Ex left when I was pregnant and he’s never met DC. He was a really decent man, so I thought, and even if we were apart I thought he would want to see DC. Anyway, whenever I hear a baby say dada or cry for
their dad my heart aches. Whenever DC laughs I just want ex to see it. Dc is nearly one now and sometimes these feelings go one week and then the next they’re back fully. I hate it. Will it stop? I’m over my ex re the relationship but not this.

I’m not sure, I still get sad when I see dads out with with kids or pushing prams etc and I’ve been split up with ex for 5 years now (but he’s also not involved) I’m sure some don’t get sad though