What should I do?

Alright, so I’m married. Have been married for 6 years now but, my husband and I have known each other since jr high (8 years total). We have always struggled because we were teens when we had first gotten pregnant and it was hard, we were both 16. Now being 25, of course we have grown into two different people. We like different things and three kids later, I’m in the process of loosing weight and he doesn’t want to do anything about himself (he’s also over weight) Even with me being encouraging towards him, he doesn’t want to change anything. Well I have now lost 20 Ibs, I still have 84Ibs to go... but he is starting to become very jealous, like where am I going? Who am I messaging. Timing me from when I get out of work. (He doesn’t work.) Its become to the point where I just don’t care anymore, I don’t care about his feelings anymore he has just pushed me to that point (it’s been building up to this from all the years and shit he has put me through). So at my job we have this new manager and he is just so kind and gives me attention, tells me I’m beautiful and that I’m looking good. I catch him staring at me and I start getting little butterflies in my stomach. I don’t know what to do. I have stoped trying to be next to him and stop communicating with him other then work related things and he keeps asking me what’s the matter and if I’m okay. 😭 I don’t know what to do anymore because I want things to work out but at the same time I keep imagining myself with this other guy. Someone help me!