Am I wrong?

Honestly I am so irritated and frustrated with my sons father. Our son is 15 months and he’s been in and out of his life. For the past weeks he hasn’t seen our son or even bothered to ask how he’s doing with everything going on. Now all of a sudden he texts me wanting to see him tomorrow. These are are messages..

Mind you this is what he does he seems our son once a week for about 30 minutes 2-3 weeks then disappears for weeks sometimes months at a time. I have never once kept our son away from him or told him he cannot see him. I have tried to explain this so many times to him but it doesn’t change. I am trying not get mad and be cordial with him. Was i wrong for not telling him?

EDIT:

Thanks for your input everyone. I know he does more than most men do for their children but me personally if it was the other way around then I would be texting, FaceTiming everyday and trying to see our son as much as possible. I’ve already filed for divorce and I filed for 50/50 legal and 100% physical with him getting our son every other weekend ( per his request because he says he can’t have our son every weekend with his living situation)  the only reason he is not involved in our sons life more is because of his choices. He chooses to remove himself from the situation and then feels guilty for missing out on our son milestones. He has never been consistent with our son since he’s been born so I guess that’s why I feel like if he doesn’t make an effort why should I?