Is this normal?

So I was recently been dumped March 8th the day before I was released from jail. The guy I've been with for 12 years and have 2 kids with cowardly left me in Oct and started seeing someone else. Whatever I'm fine also great when happy very violent when not. I found out a few days ago via e-mail from this girlfriend of his saying they've been seeing each other five years. I've been dating this amazing guy like I'm #1 fan. I've been second questioning everything he does. Looking for red flags since finding all this about my ex. I may just be tripping if nothing has ever left me questioning before and he's been very open and honest with everything thus far?
Is this normal?
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