Count the people who took the time and effort to answer your question, and you did not leave a a single comment in response. Even if you did not think any were a "Best Answer", you should at least say "thank you". The English phrase for that is "common courtesy".

To stick TO something and to stick WITH something are both "correct"phrasal verbs. I would say the collocation is stronger for "to stick to a promise"... I think the difference is when the object is percieved as a single event/point in time (a promise) versus, for example, a course of study or some other process that is a PERIOD of time... For example, Studying English can be touch so stick with it. However, it is equally valid to say: Studying English can be tough to stick to it. ( That fact that they are both possible doesn't disprove what I was saying above because the speaker could be seeing "studying English" as a point (something she did when she was in university) and also as a process (something that nevers seem to end) This is not answer, merely grist for the mill. Others might disagree and they wouldn't be wrong.

he stuck to his promise is right answer

He stuck to his promise.

I think number 1 is correct. It's sound better for me.