My long term relationships never work out. Is there something unusual in my chart?

My second 5 year relationship seems to have a similar ending to my other 5 long term relationship. My partner suddenly does not want to propose or invest anymore time in it, and I feel like something is wrong with me at this point.

I am a very easy and balanced person, have a good job, love taking care of the house and our dog, I am romantic, great in bed, have been to therapy to work on myself… I just don’t understand why I am not “good enough” for them?