think of dreams asd little conversations we have with ourselves. The various scenes pose questiuons and help us come to terms with our actions. Are we acting correctly? did we do something right? could we have done it better? I thin the dream links to these simple conversations you have had with yourself
"I really have been affected by my ex committing suicide"
"Could I have done anythiung better? could I have prevented it if I had stayed with him?"
"to be honest I could never have stayed with him."

Overall then thisn dream shows you examining your aown actions. Try to see what triggered this dream. Obviously its new year and that a time to reveiew our own year and actions. Its also the one year anniversay coming up(or just happened). So perhaps that is what triggered and brought back this issue. It could also have been triggered by something. Perhaps watching someone acting in a similar way to your ex.
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Dreams use symbols. In real life you will say something like "I need to be recognised and accepted. I just seem to constantly fighting against peopel who do not respect me in the way that they should". yet a dream will also express such a concept but in symbolic form. You maybe fighting in the dream. That symbolises the struggle in your life.
Also remember that the day before the dream is especially important in the dream. Many dreams link top specific feelings that we felt yesterday as we reform our emotions.
These pages are especially helpful in showing you how to interpret dreams
http://www.unclesirbobby.org.uk/dreamessayhowtopost.php Interpreting dreams
http://www.unclesirbobby.org.uk/dreamessayhowto.php Triggers for dreams
http://www.unclesirbobby.org.uk/dreamessay.php Dream dictionary