@Yololollipop
I hate my life. Its easy for other to judge. You dont know what its line growing up with 2st generation immigrant parents who control and coerce every aspect of your life... including your studies, job and who you will marry. What I would give for the freedom that my friends at school or work had.
I'm sorry that this happened to you in regards to the marriage/ plans laid out on your behalf.
You will find support on here if you decide you want to leave, or if you don't. But by even asking the question, you know. You know that its not acceptable behaviour whether it's cheating or not. You know you are hoping for a loophole that means that you can push the boundaries where you can. But... The loophole doesn't exist. It just leads to more sadness. And honestly, you sound unhappy. There are things you can do to change your life, there are also consequences to those changes. It is done now (assuming you are posting after the event/ cheek kiss). And now you have some thinking to do. If only because you know someone will have seen if it is a works do, no matter how unofficial a do it is.
Assuming you live in the UK, you do have the freedom to make choices about where your future goes and what direction you go in next, with work, with your relationship with your husband, with your colleague. I do understand, I lost touch with one of my closest uni friends for the reasons you mentioned. I think about her often and hope she is happy, although her descriptions of the path laid out for her were so at odds with what she would have chosen for herself if she had the chance.
I wish you well, and suggest that maybe if you have had a few drinks and are blurring boundaries it might be a good idea to stop now and take a breather, and in the morning/ over the next few days take stock of where you are and think about what you would like to do, for you.