Psychology relationship question-known each other 23 yrs., dated 3 yrs.?

I have been dating a man (both 35) for 3 years, engaged for 8 mos. He relocated for me. To spend life together. Living together 1.5 years. We are PERFECT, the male/female version of each other; exact matches. Used to communicate on no level as any other I've seen. He broke up with me last night. Said I am too jealous, insecure & need him around 24/7. We own business together, so we work together, live together, The biz = we're at the whim of others, so we have to be "available" 24/7 at moment's notice. He quit a job he wasn't happy with to start this biz w/ me, we make amazing $$! All in his name due to my poor credit. Says he will help me for a year to come, but "this" isn't what he signed-up for. Meaning, I am agenda-driven & controlling. (Because of the biz.) I DO EVERYTHING-CHILD, HOUSEKEEPING, WORK, RUN BIZ; HE DOESN'T DO MUCH EXCEPT SUPPORT MY ENDEAVOUR. 2 YRS. AGO, HE WAS OVERWHELMED WITH STRESS OF NEW BIZ + MY OWN STRESS W/ NEW BIZ & HE CALLED HIS EX. We've always had amazing communication, never thought he'd do that to me. (Cheat before & breakup now.) I've had severe trust issues since the cheating. IMPORTANT: I'm on meds that actually effect my personality negatively; I'm overbearing, stressed, etc. Up his 24/7. He says my simply telling him what we both need to do on any given day = NAGGING. All I'm trying to do is make sure all gets done on time. He doesn't do really anything. He said before, there was tough times but he was here for my child & me. Cried while saying this to me 2 years-ago. He does have issues of abandonment. Now, he says he wants to be single with no responsibility; no one "keeping tabs on him." A few mos. ago, I noticed he was flirting with women in my presence. Today he has a band practice and I needed it to happen at our place because of business requirements (long story.) He said, "No, I'll do what I want. He doesn't want anything to do with biz, anymore. Doesn't want stress/have to babysit employees. Nor, does he want anything to do with me. No in a mo.; before that, 1 time last mo. 3 weeks ago, had 2 long (wonderful) talks regarding my meds & the negative way they effect me. I used to be relaxed, free-spirited, calm. Now I'm VERY high-strung, OVERLY STRESSED. He said I lock myself in the home office 12 hrs. a day (I have to; another long story) & when he wants me 2 spend time, I'm too busy. When I'm free & avail., he pinches & tickels but it hurts sometimes. ((In my opinion, I do EVERYTHING, BUT DON'T TELL HIM. I MAKE HIM FEEL IMPORTANT.)) But he says my daughter whom is stressful & testing limits is too much, as is the time I have to out in for work. WE USED TO HAVE AMAZING COMMUNICATION; BE BEST FRIENDS, DID THINGS SPONTANEOUSLY. His estranged dad just ped, he's depressed and feels he wants do do something more productive w/ his life. Plus I am driving him crazy asking for him to take care of responsibilities. Friends used to say, "He is into you, totally in love." He's SO distant now & last night broke engagement. We lost, somewhere in the stress of reality, the serious bond & communication. I want to STOP this break-up. Any help would be appreciated!