If you have been apart for 3 years, don’t you think you have your answer? You are young, you have so much life left. Do you want to spend it on a man who will more than likely continue his online activities? How long before those online activities turn into real physical affairs? I have been married 21 years and am dealing with a cheating husband who I have forgiven numerous times, I have finally realized I am not a priority to him and neither is our marriage. I have tried, but one person can not try to save a marriage if the other does absolutely nothing. As for his mother, my husband was extremely close to his parents, too close for my comfort. He could always drop everything to help them in any way, but I was expected to vacuum the house with a broken leg, just one example. Best of luck