A last-minute invitation can be exciting once in a while. When it becomes the only way someone sees you, the pattern starts to say something about priority, effort and respect for your time.
Look at the full pattern
Some people genuinely have unpredictable schedules. The important question is whether they communicate that clearly and ever try to reserve time in advance. Busy people can still show consideration.
Do not keep every weekend empty
If you protect your schedule hoping they might call, they receive convenience while you absorb the uncertainty. Make your own plans. An invitation is not an obligation to cancel what you already chose.
State your preference directly
Say, “I like seeing you, but last-minute plans do not always work for me. I would rather choose a day earlier in the week.” That is a reasonable request, not an ultimatum.
Watch whether behavior changes
A person who values the connection will make some adjustment, even if every plan cannot be perfect. Someone who only appears when other options fall through will resist planning because convenience is the arrangement they wanted.
Spontaneity should feel mutual and fun—not like you are permanently on standby. Your time has value before someone decides they are free.