Of course he doesn't mean it. He's got no intention of letting such a willing emotional, verbal,financial, and sexual punchbag slip through his fingers.
What he's doing is trying to make you feel that you're in the wrong in the expectation that you'll grovel to him, at which time he'll prolong the torment for a while before magnaminously 'forgving' you... providing you do something to 'prove' your love for him, such as ending your friendship with the feisty woman who won't take any of his shit because he doesn't he want you seeing him as she does.
If you don't grovel he'll 'find it in himself' to forgive you anyway because of course he loves you so much, you're so good together, you mean everything to him, he can't live without you and other such phrases which he only uses to get what he wants namely, you under his complete control.
Needless to say, whether or not you grovel, he'll punish you for not giving him the 'respect' he believes is his due because he chooses women who will be completely subservient to his will in order that he can be the demigod he believes he is whereas, in fact, he's pathetic inadequate; a coward who'll run a mile from a self-respecting woman who gives as good as she gets - as evidenced by his abrupt departure when your friend got on his case.
As for you claiming its not that easy... o yes, it is! All you have to do is to control what you are thinking and replace any fond thoughts of him with recollections of how you felt when he was sexually debasing or verbally abusing you and negate any thoughts you have of continuing this unhealthy association by visualising scenes which are appealing to you - the ocean, mountains, favourite piece of art etc - or picturing yourself as a strong confident woman who is capable of making positive life choices for herself and her dc and who chooses not to have relationships with men who don't enhance her life.
Get rl moral support from your mates to make sure you don't waver and run any new men you may alight on by your kickass friend before you
embark on another relationship.
Your dc deserve a lot more than they've had to date and so do you. Stop the rot now and resolve to make sure they grow up to be all they can be and are not conflicted by their dm's relationships with the opposite sex.
You CAN do it and, once you put your mind to it, you'll find it is far easier than you currently seem to believe to stay true to your resolve.
As per usual: Freedom Programme, read the sticky 3 times a day.