need help analysing toxic room mate situation

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hey guys i just got out of a room mate situation which made me very unhappy and i'd like some second opinions to help me pinpoint just what was at stake here.

i've frequently shared my house with others via couchsurfing and airbnb and these people have been generally courteous and not difficult to get on with. this person's presence made me constantly stressed.

some of the problems i experienced
- was initially helpful with the chores but contributed less as time went on
- constantly badgered me for time and attention, talking incessantly to me as i attended to other tasks
- needy "please take care of me" behavior
- couldn't figure out how to not be home when i was; i was starving for alone time; couldn't think thru my own, pressing problems with the constant interruptions.
- interpreted my frustration with the above as "being angry" and did not amend his behavior

i ended up getting in a car wreck during his stay which i chalk up to being unable to attend to the warning signs (i suspect previous alignment issues) as well as driving stressed. this has cost me a lot of money.

i feel very stupid about all of this and wonder how i managed to get myself in this situation. the thing is, i normally have decent boundaries and am appropriately assertive in my relationships. where did i go wrong? is my boarder a massive asshole is there something about myself that needs work too?