Should I tell ex husband/baby daddy happy birthday

Long story short we were together for 5 years married 2, we have 2 kids a 2 year old and a newborn that I just had April 1st. We broke up July 30th I found out I was pregnant with our 2nd aug 2nd, he wasn’t really happy, and said I was probably gonna miscarry (history of early miscarriage) anyway he started talking to his now gf very shortly after we broke up, and few months later knocked her up, my entire pregnancy. He never asked about the baby in the beginning he told me to put him up for adoption and Also told me if anything happened to him he wouldn’t be upset because he didn’t want him. He only met our son once for maybe 10 mins. And he only gets my daughter once a month for one weekend and I’ll told me yesterday he was gonna go another 4 weeks with out seeing my daughter with will be 2 months with him not seeing her because of “work” (he owns a lawn care business) but he still manages to get his oldest son who’s 5 every other week for a whole week. And he says it’s awkward or his gf because we had a child together when we weren’t together this entire time granted he knew I was pregnant before he started talking to her. I sent him a 1 month old pic of our son yesterday and asked if he liked it and he completely ignored the question. He was never like this when we were together he completely changed after we broke up. But anyway today’s his birthday should I tell him happy birthday??