You haven't reached your "deal breaker" point yet. You have all the proof you need, he admits to cheating and yet you still accept this type of behavior from him. I think you are afraid to be alone, I understand that you can afford to live without him, but you don't want to. You've gotten so use to the drama he is causing, and your daughter is even caught up in it, which is a big no,no. She should not be in the middle of it like this.
He might have everything he wants financially while he is living with you, and maybe thats why he isn't leaving you just yet. He knows he can cheat, and you won't kick his azz to the curb like you should be doing. He has it good and he knows it, so he is using you. How does it feel to be used Sue?
What he is missing from your marriage is the attention, the ego stroking, the affection and the sex that these women are giving him. So he goes on line, or he patrols till he finds someone who will pay attention to him and then he gets what he really wants. Getting a lap top wasn't the problem, the problem was he was missing something very important and being a typical man, he went out and found it. Thats what men do. But you haven't given him any consequences to his behavior. So what if you find this evidence or that, what does he loose,,, nothing... what are you loosing... your self respect, your dignity, your morals.. you are teaching him how to treat you and that your marriage means nothing.
Now he is going away, alone, for a bachelor party... he will meet someone there, he will take someone with him, or maybe just visit one of the hooker ranches out there and have a grand old time. If your sleeping with him, I hope your making him wear a condom, cause hip surgery will be the least of your worries if he brings home an STD or HIV to you.
Your mothers right you don't deserve what he is doing, but in a way you do... cause your not kicking him out. What kind of example are you setting for your daughter. Do you want her to see you as some desperate woman who will take sloppy seconds from some man? Do you want her to see that your husband doesn't respect you or love you and this is what she can expect from her BF or husband? He isn't even trying to improve your relationship, he is being selfish and self centered and doesn't care.
Get it together, go back and read what you have written here in your original post. What would you say to the woman who wrote it? Doesn't she sound pathetic and desperate to you? If you want to live your life with a cheater, than just stop the investigating and let him be, let him go cheat,, your not going to stop him so the choice is yours.. just stop the drama and you live your life, let him live his and co exist under the same roof.. or get rid of him and be happy. He will be just fine without you, cause he is the type that uses women, he won't get an apartment on his own, he will immediately set something up to move in with one of his conquests.. that what cheaters do... Worry about yourself and your daughter and forget the bum.