bf went on the road with him this past week so bf got very little sleep It may not be due to the truck driving. He may have choose that because he wasn't sleeping well
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But he just threw away our relationship because I wanted to spend alone time with him? I tend to not want to be alone with anyone when I am hypo-manic/ manic because not being everywhere or constantly moving irritates me to no end. I generally can not hold a conversation and occasionally can't really make out English without complete silence and "blinders"

Please help me understand him and what I can do to get him back? Right now, read, read read, not just the technical stuff but the personal stories too. In my relationship we wait and do as much damage control as possible. Concentrate on your child/ren right now. This is as heartbreaking to them as it is to you and they may not be able to express it.

I did not know what a manic episode looked like or I would have prolly seen it and things could have went better. keep a little journal of all the things outside his normal personality, so that you know for later but the fact is you could have met him on an upswing because you're engaged after 2 months and his recent refusal of meds.

How long does a manic episode last? Really depends on the person but depression can be as hard and deep as the mania.

Does one realize they made bad decisions even if they dont realize it was a manic episode? Sometimes, but it's hard to care over having fun.

Will he later see he shouldn't have gave up? depends on him.

What can I do to help him and support him? This really depends on your living situation. Feed him if he comes by.

Should I just wait it out and let him contact me when he is more stable? That's solely your choice.

Should I try to contact him and talk about it? If he's not thinking rationally then probably not. If he has family that you are close to and except his Dx, that he has to take meds for it, warn them that he's not currently taking them.