Am I wrong for this ?

My son’s father does absolutely nothing for his child. Two years on my own, all on my own & grateful to god for giving the strength to do above & beyond. But his mother feels like I have to reach out to her because my BD told me she’s here? When she should be the one to reach out? After years? After coming to “ see your Grandson? & you leave in a day & been here a week & think I have to reach out ? After a DV case involving his father being physically abusive? Am I wrong for expressing my anger? Am I wrong for telling her my son has nothing to do with neither one of us or the situation? I’m always being painted a bad person - I just give too much of my energy.