Do you all think my guy is planning to pop the question in the future?

I don't know how long you two have actually been going together prior to the break up, but just MAKE SURE "if" it in fact is an engagement ring, you're ready to make that final commitment. It sure sounds as tho he does have some kind of jewelery in mind for you after a question of that nature. Just take your time & be sure, that's all that's important at this particular time...the best to you...:)