In a tough spot, is dating a guy I used to talk to brother bad in this context?

it sounds bad but here’s the story. Back to last year I met a guy we will call him Tom who was about 3/4 years older than me and we started talking to each other it was short I’d say maybe a month and we kissed once on our date he wanted to take it further and do more than that but I didn’t want to get intimate with him too soon. Anyways towards the end he wanted to invite me over but I knew his intention was to hook up so I told him let’s keep dating and we will see where we go down the line since we had only had one date. During the date I had asked Tom when his last relationship was and he lied and said it was years ago and he didn’t consider her a girlfriend. When I said I didn’t want to come over Tom then texted his ex to try and get her to come over and hook up with him and his ex was aware of me and him talking (apparently he started talking to me a couple days after they broke up which I did not know, I don’t wanna be a rebound girl). She texted me and told me so I stopped talking to him that day. Since then he’s been dating other girls you know moved on I think he’s with someone officially now but that’s not the point. Anyways now a whole year later, I got on a dating app and came across a guy (Bob), bobs pretty cool and it’s going great he’s my age, but he started talking about his pet cat and he said the cats name and then I thought that sounds so familiar. So I went on his social media and saw 🤦🏻‍♀️ Tim is bobs older brother. Bob does not know I used to talk to his brother but it’s so soon I don’t want to say anything because technically I had to dig for that information and I don’t know what to do lol. Obviously that’s something that’s gonna have to come up sooner than later but I don’t want to be bogus and ghost him either. He’s a good guy, but I did kiss his brother. I don’t know if I should just tell him sorry it’s not going to workout and just stop talking to him. Me and Bob haven’t been on a date yet so I guess I should call it quits now right?

In a tough spot, is dating a guy I used to talk to brother bad in this context?
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