I agree. This was an issue of God's honor and Glory, not any personal issue with the couple involved, I don't believe Peter had bitterness against Ananias and Sapphira, nor did he have a personal offense against them, either. Peter even says directly -You haven't sinned against me, but against God!

https://www.blueletterbible.org/kjv/act/5/1/s_1023001

In fact, he explained to them the full of their sin - 1) it was your property to do with as you pleased: you could have sold it and said we are donating part because - any number of reasons. 2) When you make a vow to God you are responsible to keep it. but you premeditated this deception to say we are bringing the full price when it was partial - they could have brought the gift and said nothing. 3) This was essentially an act against the whole congregation, a direct sin against God, and done with a 'high hand' -since it was in front of the whole congregation, inferred by Acts 5:11.

Jesus even brings up what to do if there is a personal matter and the person refuses to repent: Matthew 18: 15 - 19

“If your brother sins against you, go and tell him his fault, between you and him alone. If he listens to you, you have gained your brother.

But if he does not listen, take one or two others along with you, that every charge may be established by the evidence of two or three witnesses.

If he refuses to listen to them, tell it to the church. And if he refuses to listen even to the church, let him be to you as a Gentile and a tax collector.

Truly, I say to you, whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed[fn] in heaven.

So yes, we forgive all who offend us. But I can't forgive a sin against you -it's your part, and it would be presuming falsely a right that is not mine If I were to do so.