Explanation:
She promised me that she won't let me down.
The answer you are looking for I believe to be <span><span>
<u>4) A type of monologue in which a character speaks to himself and expresses his sincere feelings and thoughts.</u>
</span></span>The actual definition of <em>soliloquy</em> is "an act of speaking one's thoughts aloud when by oneself or regardless of any hearers, especially by a character in a play"
Though choice two is a great possibility the keyword you are looking for is "speaking to himself"
I hope this is right and helps!!