Define "has", "enough", and "us", please.
At the moment of that picture, he can be in a relationship with 11 (Martha, Norah, Samantha, Emma, Eileen, Simone, Daphne, Alexia, Scarlett, Erika, and Saira) of the 18 girls in the picture. Plus Maddie and Megan. So, in total, he was in a relationship with 13 of the 22 LIs. After that, he opened another path (Debbie) and pre-opened another one (Meemaw).
I'm fairly sure Samantha wouldn't think of the MC in terms of "having" her.
Girls not yet in the harem: Amanda, Eva, Kiara, Meemaw (kinda), Kim, Betty, Kate, and Lisa. And the 6 on the last batch of students.