Thank you for your question. That is a good question and a commonly asked question and many people have written much better answers than what I will give you. But I will try to provide you a short answer from the top of my head.

First of all, God gave human beings free will because God wants us to choose to love Him. Without free will, there is no real love, because love is a choice. If we didn't have free will, then we wouldn't have the capacity to love either. But the thing with free will is that we can also choose to hate and do a lot of harmful things to each other. God gave us guidelines how to live, but when we disobey and do things according to our own wayss and choose things that are harmful to others and creation, we cause suffering in the lives of others both humans and animals, and even nature. When we choose to have wars, murder, steal, even lie, slander and cheat, we harm others. This is commonly called sin and the consequences of sin affects humans, animals and all of creation.

The beautiful thing is that God loves us so much that He came into His own creation in the person of Jesus, to show us what true love is, and to redeem us from all the wrongs we've done, by giving us new life in Christ and forgiveness for our sins. We love because He first loved us.

I hope this answers your question. If not, please feel free to ask further. I have gone through a lot of sufffering in my own life, but I am truly thankful to God for transforming me ever since I accepted Jesus into my life. I only started to understand what true love is through Jesus.

Thanks again for your question. God bless you my friend.