You’re doing a great job just by being here, and seeking support, and sharing your feelings. Working on yourself like this is such a brave step to take and it’s a shame your family aren’t being more supportive of you. Is there any chance you could find a counsellor/therapist or someone similar to talk to? Sometimes just talking things out to someone who isn’t involved in the situation can help.
And as for your ex - it’s much easier to get into a “relationship” by presenting a false image than by actually truly sharing yourself and your vulnerabilities, but it won’t be real. So he may be getting remarried but he’s probably just looking for someone else to use like he did to you, and that’s quite a pathetic thing for a grown man to do.
Anyway, I really hope it gets better for you soon. You deserve to be loved, as we all do, including our flaws. Cry if you need to cry, feel overwhelmed for a bit if you need to, but just keep going.