If he takes vacations from the relationship with no warning it means he isn’t worried about losing you, and this is never a good sign.
If a guy knows for certain that you’ll always be there waiting in the wings, no matter how badly he behaves, he won’t respect you and he definitely won’t want to commit to you–why should he when he knows he doesn’t have to? His disappearing acts serve more as a way to let you know this relationship isn’t serious and he is still free to do what he wants.
the tell tale sign that he’s all in, he’s committed. Maybe you don’t meet them right away, but he should give you come sort of indication that it’s on the horizon.
At the very least, he should let you know that his family is aware of your existence.
When a guy is serious about a woman, he shares himself with her.