I lost someone to suicide, but it was after we broke up.

When he killed himself, I was already with someone else. It was hard, but it's not a betrayal to love someone, whether they're dead or alive.

How long have you been with this new person? Do they know your ex committed suicide? I'd talk to them about it. They'd likely be understanding of your situation and appreciate the open honesty, especially when it comes to something so raw and personal.

I'd also tall to your therapist about what they suggest. Sometimes there are other support groups with people in similar situations that you can reach out to, and you're therapist might have a resource.

Just a thought. It might help.