Should I tell my ex?

My boyfriend and I just broke up on Saturday night, and we did not end in good term because of me, I am not proud to say it but I was kind of acting childish and I told him, that this is the last time that he will hear from me.

My birthday was in February, and I have told him that I want to celebrate my birthday, and he was excited too, I am doing my party on April 1st, and I invited his brother and cousin because I made a promise to them of inviting them to the party. Since I had this “dream” of walk by his hand on my party, I feel like I need to tell him that I am doing it, because it might sound dramatic but it was something that we both were excited about.

Also, on Friday I told him that I might be having a little infection going on, and that today I was going to my gynecologist and that he might need to get treatment too. I went to the appointment and my doctor said that he might think that I am not having a big infection, but it is better for my “partner” to get the treatment too.

What should I do? I really don’t know if he is still angry with me, so I really don’t want to bother him, and tell him about the infection and the party.

I was just planning on saying something like

“Hey, sorry for reaching out to you, but my doctor said that you need to drink this blah blah, and just to mention, I am doing mu party on this date, sorry for bothering you, have a good night bye”

Obviously it will be his problem if he completes the treatment.