Single mother

So long story short I’m 6 months pregnant and who I thought was a changed man was nothing but stuck in his old ways, I had to cut my ties for the safety of me n my future child.

But the joys of overthinking have got me questioning how to explain to my son when it comes to a father figure,fathers-day, etc. how to go about it.

I myself don’t have a father figure close to me and I don’t want my child to ever be bullied or feel like his dad didn’t want him. But again it’s a bit of a complicated situation and I know it will be a subject one day.

Any advice?