Why did he kiss me?

I was at my friends party.
Im 37 & there’s this older man who is 65 who I get along really well with.
He's good looking for his age.
I've known him for nearly a year & I thought he liked me as he always had his arm around my waist, touching my ass etc.
I never had his number so after lockdown I found out started seeing someone else.
At my friends party recently we were catching up. We had a bit too drink and he kissed me.
He said he has always liked me but with the age difference he didn’t ask.
We kissed a bit after that & he wants to break up with the other lady.
He said they’re just dating cause they didn’t have anyone else.
Should I go out with him when he breaks up with her?
Why did he kiss me?
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