Based on the context and the answer, generate a question. 

Context: For whatever reason , Ennis had changed , and Jack was excited to be the recipient of his new feelings . Still , a small part of Jack remained guarded . Ennis 's history required a bit of self - preservation , and Jack could n't help that . It hurt , but it was necessary .

Answer:

He was afraid of getting his feelings hurt .



What may be the reason Jack remained guarded ?