Ah I see.
She came onto you, and you were sort of cornered into it, you poor thing.
So the obvious thing to do would be to share a taxi home together.
And of course at no point actually TELL her to stop holding your hand or touching your leg, or coming onto you.
And then, of course, on leaving the taxi the obvious thing to do with someone you were hoping would get the message you are not interested is to lean over and hug and kiss them.
And you're only worried now because SHE is married.
And yes, of course you should tell your wife.
Most wives would consider trying to kiss another woman as cheating. Put it to her gently along the lines of:
"This woman, our neighbour actually, was coming onto me, telling me how wonderful I am, so I couldn't tell her to stop in case she got upset.
So she carried on, telling me how good looking I am and kept touching me. So again, didn't want to upset her so just played along, as you do.
So then we decided it was a good idea to share a taxi.
She kept touching me again and holding my hand.
I still didn't tell her to stop it though, because you know, I didn't want to hurt her feelings. (wasn't considering yours at the time though love, sorry).
And then when I got out, I thought the reasonable thing to do would be to
hug and kiss her. But only a brief kiss, and It was because I didn't want to hurt her feelings.
You know how it is.
Only I've got to tell you, because I've just found out she is married!! So you might end up finding out from someone else.
Good luck with that then OP.