Triggering others inferiority

[Whoamy]

I'm hoping some of you can help me with something. Last night I was dumped. Again. Over the last 15 years I've had 3 serious relationships. Two of the three cheated. One cut off my access to friends and money. One told me I was amazing and everything he ever wanted, but had another long-term relationship on the go behind my back.
When they dumped me, both told me I'd made them feel not good enough for me.
I did about a year of therapy, and realised how abusive these relationships were, and tried again.

The most recent relationship was mostly good. Not abusive, I don't think, though he could be quite critical.
But, having ended things last night he has also told me that I made him feel not good enough.
And now I'm left wondering: is it me? Or at least, partly me. And if I make people feel like this, how can I stop doing this?
(Please be at least a bit gentle - I have just been dumped! But I do really want to fix this, if it's a me-problem). Thank you.

It is hard for someone who has never met you to come with any solutions to this. I think you either need to ask friends for feedback or talk to a therapist.

One of my SILS tend to behave and talk like noone is good enough and really doesn't understand why she can't maintain relationships, romantic or otherwise. My other SIL and some ex friends have tried to explain it to her but it didn't help.

Thank you. I don't seem to have the same problem with friendships or relationships at work. As far as I'm aware. But I do plan to ask some close friends. And speak to a therapist again.