What is he only sees me on weekends?

Without additional context, it is difficult to determine what exactly "he only sees me on weekends" refers to. Here are a few possible interpretations:

• If a person says "he only sees me on weekends" about a romantic partner, it could mean that the partner lives far away or has a busy work schedule that only allows for weekend visits.
• If a child says "my dad only sees me on weekends" about their non-custodial parent, it could mean that the custody agreement only allows for weekend visitation.
• If a friend says "my friend only hangs out with me on weekends" about a busy friend, it could mean that the friend's work or school schedule only leaves them free on weekends.

In all cases, it suggests that the person in question is not able to see the speaker or spend time with them as frequently as they would like.