Can I to stick with what was agreed upon?
That sound's reasonable. Was there any form of agreement or gestures?
Yes, when we shook hands on the agreement.
It's responsible to stick with what you agreed on. Both partners should be happy if they discussed the outcome of their decision.
I agree. But if it does not work out, I will not deal with it.
You can only do so much. You are good on your part for sticking to the agreement, so hopefully the other party will also be honorable and stick to it as well. You are really a champ for being honest and dependable on this, so just know that if it doesn't fall through, it was not your fault.