I can tell you the following true story.

My older cousin, a Russian woman, was in her PhD program in Ithaca, NY.

She had an Indian bf.

The bf would not make the r/s public. E.g. he would cook meals for her inside his apartment and not eat on the patio - yes, to THAT extent.

After he finished his program, he got an offer to teach at a Business School somewhere in Colorado. He accepted the offer.

He was very happy to be with my cousin, but still, right before it was time to relocate to Colorado, he broke up with her, went to India, and married a woman designated by his parents. He had not known her before.

So education, income, etc. etc. just do not matter. They do not make a difference sometimes.

My cousin was pretty heartbroken, but eventually had more bfs, then got married, then got divorced, and finally settled with her second husband with whom she had a son. So in the end she did fine.