When does it mean he doesn't love me&;#063;

If he goes on holiday without me,
is that it?

Or if he doesn't phone when he says he will,
is that it?

What if he flirts outrageously with my friends, with my mother,
is that it?

If he says he loves me,
does that mean that he really does?

If he buys me flowers and chocolates,
what does that mean?

If he never lets me down,
is that love...
or just the sign of a reliable person?

How does one know?