Should I go back to my ex?

Hi all,

I already know I’m either going to get shitted on for this or no comments at all but this is the predicament I’m facing currently.

I broke up with my ex 6 months ago after being together for 5 years due to catching him having a dating app and talking with women. I seen him as a husband and he has been an amazing boyfriend prior to that. But the relationship was getting toxic towards the end and I could tell he wanted to explore outside so when I left him he didn’t chase me at all and this broke my heart.

3 months later I meet this man and he was love struck. We both had an amazing sexual chemistry for eachother and love being around eachother and started dating official. He tells me he loves me and that he’s so afraid that I hurt him, he literally tells me almost everyday that he’s scared I might go back to my ex and break his heart. He talks about me moving in with him for November but I’m still hurt and bit still caught up with my ex.

Two weeks ago my ex texted me his dog passed away and we cried on the phone together. Ever since then we have been texting eachother non stop but there is no flirting just catching up and I have even been speaking a lot to some of his family members..

My current bf does not know and I want to tell him the truth but I know this will kill him. I do care about him a lot but with my ex I can’t explain it, it feels like home and his family was my family and to hear their voice I could tell they missed me too and I just don’t know what to do. I wish I never rushed into a new relationship because I don’t want to ruiny boyfriend. He’s so handsome, so romantic And kind I don’t want to turn him cold. Please anyone give me a suggestion without telling him that I have conversations with my ex.