Excellent advice from Media. You have suggested some good solutions in your details too..
I have a photo album from a past relationship with an ex boyfriend, back when I was 16. I kept it because it was part of my past memories. My memories were not just with him but with many special friends. When I married my late husband, I asked him how he felt about me keeping it. He had no problem with it. I had no problem with him keeping his past picture memories either. We didn't mind because we trusted our feelings for each other. We, also, understood it was part of our treasured past.
You're decision is actually a personal one. Therefore, take some time for this thought. There's no wrong way to handle this, just follow your heart.
Finally, if making a decision now feels rash, or too painful. Then simply put everything away in a safe place. May I suggest a cedar chest or a plastic storage container. Then revisit this sensitive decision down the road.
My best to you as you continue moving forward.