Thanks for the extra information. It helps.
I'm not sure that placing this on a shelf is a good idea. This is something that was good happening to you after a lot of loss. Even if your father's death and your divorce were things you were alright with and worked through on your own, it still would affect you. Having a new love, someone who makes you feel like a teenager, would be a welcome feeling. It would give you a feeling of new life, a new beginning. To have it end so abruptly and without time to process it would be a huge blow.
This sounds like grief. You are faced again with trying to work through another loss. It can make you feel overwhelmed, angry and sad. Plus, there is unfinished business with you and this man and that can make the grief worse. And there is his other life which complicates things even worse.
To get closure, this is something you will need to work through, unfortunately without the man you need to talk with. You can do this by working slowly and being open about how you feel.
One good way is to write out how you feel. Write your boyfriend a letter, not to mail, but to keep for yourself. Say everything you feel, don't hold back. Revise as you need to and add to it as you need to.
Another is to talk to a therapist. Working this out is not something you need to do alone. Having support is important in dealing with loss. You can talk with your doctor for a referral or if you attend church, your pastor can help. You can also search on line at http://www.therapytribe.com/Therapists/Denmark.
Although you are familiar with grief, this is a different kind of loss than before. Understanding what makes it different and learning more about how you feel can help you heal. Here are some resources to help:
How to Survive the Loss of a Love by Peter Mc*****, ***** H. Bloomfield and Melba Colgrove
Recovering from Losses of Life by H. Norman Wright and Norman H. Wright
You can find these books on Amazon.com or your local library may have them for you.
Remember, give yourself time. You need to be good to yourself. Try to get out often, be with friends, treat yourself to something special like a getaway with friends. It will take time to feel better. But you will.