You're right, in that it can be difficult to accurately evaluate, or read someone without having ever met or gotten to know them. However, from what little I have read of yours, or you--from you. In so far as I can tell: you don't sound, or come across as someone whom would boast a boatload of undesirable characteristics, or personality traits, maybe that is taking it to far. To try or to attempt to judge someone in that way? You seem to come off, or across to me, as someone who would be able to attract others, and to want to be around and to get to know them, etc. And this includes relationships of all kinds - thinking of it, in my case & or from my perspective as that of a friend, or colleague. Something like that... So while it is common to try & draw some kind of a link, or an association. I'd wonder if you aren't somehow seeing more of the negatives, and the overall ones that had ended in failure, as opposed to those that were either more on the neutral end, or even more likely than that the positive one.
For we can tend to forget them, sometimes, especially throughout our history & when in the rearview. Much like with compliments & everyday praise. We just sort of expect them to be there. Because we have these high standards, or expectations for ourselves. So it is almost as if that is what is expected, or required. In other words--no big deal. Then when we do come across something where it doesn't work out, for whatever reason? A personality conflict, something else. Well, then we just can't seem to quite forgive & forget so easily. And we then collect that sort of in our memory banks. And place them in some kind of our own personal hall of shame. Easily & readily able, or available, to recall. Then next thing you know, we have a more catastrophic one, on the scale, or in those terms.
Suddenly they're right there, when we "need," them. To reinforce all of those negative beliefs, and really, inaccurate and false perceptions.
However, if we ourselves believe them, then they are in fact, true to us! ...I'm really sorry to hear of your horrid & horrible tenant. Talk about a stress, and a stressor!?. . . . I only hope that you wouldn't look at things like that, and compare. Taking away the nature of this relationship, in particular, with the dynamics involved and all. To judge like that, isn't fair to yourself. For we're always going to see the worst side of it, if we compare .