She seemed so much happier without him it's weird
I don't follow Sarah, but I saw her on my fyp as I follow a lot of outdoors/hiking content and during lockdown was looking at UK content.
Ok, so happier without him is not weird at all to me, this woman seemed to go down hill rapidly when she started dating him.
She has grown back to her original size (horrible after all that hard work and getting rid of her old clothes) quit various jobs and everything she does is centring him. He is using her as free child care, someone to pay the rent, take care of the housework and look after all his needs before he goes off for mysterious periods away for 'work' while she gets nothing in return. she then tries harder and harder, does more and more. Horrible situation for her, and she seems fairly sweet away from him, she used to go hiking etc but now apes his hobbies only (the bike)
If i were a friend or family member I'd advise her to dump him. He is his main priority which is bad as he had a small child, she should be a very close second after the child, he is mean to you and, tbh not attractive. move back to your family while you get back on track with your whole life, your work and weight/health. do not take him back if you loose all the weight you gained and he comes sniffing back again. You can find someone who trusts you like an equal and if not better off alone with the pug.