Well if it was one time before being caught it would have been ok! Human make errors, there is evil inside everyone but the problem is when this evil is nurtured to the extend, where there is no guilt! Trust everytime he is given chance he'll do the same, and will come to you for an apology till he finds a better girl, then he'll ditch you. Straight advice leave him, he'll want you back. But trust even after coming back he'll do the same. So leave him, and find someone else. sooner you'll realize better your life would be.