My boyfriend invited his ex to his party?

WinCx3d
I over heard my boyfriend inviting his ex to his party. My boyfriend talks to his ex regularly they seem close. I’m not an insecure woman so i don’t think anything of it

Today he FaceTimed her while at my house. And when she answered he went into the other room. And he starts telling her about the party.
She says well i don’t know about going
So he starts asking her why and then he says “are you not going because I’m going to be there” then he says “bring your mom your sister your cousin to the party just come and i been missing you too so yeah come”

So she says “well you got a girlfriend so i don’t think that’s a good idea” and he says “I’m single i don’t owe you or nobody else nothing”
Then he said if you don’t wanna talk or deal with me anymore just say that” “even if you don’t i know you’re going to text me again sooner or later asking to see me”

TL:DR; am i overreacting or am i underreacting? I don’t think she should be invited to go
My boyfriend invited his ex to his party?
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