Toxic relationship/new relationship

Me and my ex broke up around almost 6 months ago. We only dated for a month but we talked for a few months before then. We where back and forth during them 6 months but it was never official. Our relationship was very toxic. He had many mental health issues and he was emotional abusing me and we both just couldn’t take it no more so we ended it all about a month and ago. I started seeing a guy very unexpectedly 3 weeks ago so about a week after we really ended things with my ex. I wasn’t planning on moving on so fast or anything but this new guy I’m seeing is amazing. He is just so sweet and kind and just everything my ex was not. I ended up sleeping with him expectingly again but it was just so much different then me and my ex. That’s why I’m just over thinking I guess now. The new guy is amazing in every single way but he’s not my ex at all and it’s just so different. With my ex we was so comfortable around each other but we just argued way to much. He cheated and I don’t trust him at all. He really took a toll on me. I just don’t know what to feel honestly. Is it bad I feel like this? I will never take my ex back due to everything that he has put me through but if it normal to have these feelings from past relationships going into a new one? Should I tell this new guy how I feel?