Am I wrong for feeling this way?

Sarah • Jake😍 momma to 2 sweet boys + a bonus momma to a beautiful girl photographer
My boyfriend wished his baby momma a happy Mother's Day. They're not close or anything like that she keeps the baby away and we're going through court for that. But I just can't help but feel sad or betrayed because he did this? And not to mentioned he deleted it from their messages.... I'm 4 month pregnant so maybe it has something to do with my hormones