Am I wrong

On the 18th of this month my friend (an ex) passed due to a car accident. My boyfriend is upset because he feels that I’m to upset about his passing. At one point my ex and boyfriend were friends; however my boyfriend had sex with my best friend (saying it was just a mistake) and I forgave them both. Since my friend death I have begged my boyfriend to forgive and forget. Am I wrong for being upset about his passing? Am I wrong for telling my boyfriend to forgive him??