1. He avoids eye contact with you.
A person's eyes can reveal many secrets. If he subconsciously avoids your gaze when talking to you, it is very likely that he is hiding something from you.
2. He promises you anything.
When a man lies to a woman, he tends to compensate for his guilt by fulfilling her wishes. If he is not usually a generous or magnanimous man, then you should be more cautious.
3. He kept repeating the same statements.
This indicates that he is trying to convince you, striving to make you believe that his lies are true. Furthermore, if his voice exhibits any strange changes in tone, it also suggests that he is trying to conceal his panic.