Sorry you are going through this. I hope the following post is helpful, and truthful and not too harsh. I mean it for your highest good.
Healthy relationships are not this hard.
Addicts will hate anyone that gets in the way of using chemicals in some form to deal with life vs. the hard work of recovery. So yes, he probably does not have positive loving feelings toward you right now, but then addicts normally have only two modes - manipulating to get what they want or anger/repulsion/criticism. So, there is a good chance that his "love" was not the kind of healthy love of two normal adult people, but the machinations of addiction.
Any addict not ready for active recovery will jettison a relationship if it gets in the way of the drugs - and immediately find a new person who will put up with it. That's not love, that's dependency. So, while it is very disappointing, feels like betrayal and hurts a ton - of course an addict will throw you to the wolves if you want the drugs out of the equation.
The really important thing here though, especially when feeling really down, is to realize that if you can figure out why you put up with all this, you can be free of it. Thousands of healthy women would not put up with this insanity for 10 seconds. And, there are many women who go back to this kind of bad treatment again and again and again. Which one do you want to be?
Figure out the empty space in your own heart, develop a good relationship with yourself and your higher power, and you can be free of all this nonsense - because that's what it is - non-sense.
Oh, and about the cousin's post... birds of a feather flock together. So, try not to take the adolescent posts of another immature person to heart. No contact is the best way to keep from seeing all that adolescent nonsense and keep your focus where it belongs - on you.
Prayers for clarity, courage and hope.