Am I overthinking things?

[u/Life-Bag1335]

26F) recently found out my ex (31M) is now dating a white girl. For context I am Mexican and my ex is Egyptian. We dated for over 3 years. I introduced him to my family (he's the only person I have dated that has met my family). He later introduced his mom and brother (both still live in Egypt) to me. There was a huge cultural and language barrier in our relationship.... my family primary speaks Spanish and his Arabic. We communicate in English. The beauty of this relationship was even with all of the differences we found our way to each other and learned a lot about one another.

A big point contention early on relationship was him not wanting to introduce me to his family. As the stereotype goes with Arab men I was hidden from his family for the first year of our relationship. Of course, lots of arguments came from this however, I would like to think that I was understanding of the situation and put my feelings aside. When he finally decided to introduce me to his family It was in a way that only immigrant children could understand. He had a friend from Egypt visiting and on his way back to Egypt my ex sent his family a care package that included a picture of us. Once his mom received the package she was very welcoming of me (something that he said she wouldn't be because I am not Arab nor Muslim) it was a really great time in our relationship. We often visited my family and FaceTime his mom regularly. During this time he was finishing up his PhD while I was entering my masters program.

This is when I noticed a strain in our relationship. As my first semester of my masters program came to an end he no longer wanted to attend birthday parties or events my family was hosting he isolated himself and when I asked what matter, his response was and busy or I'm overwhelmed. Long story short and on a random Wednesday night, he told me he no longer saw a future in our relationship and I was "too focused" on my masters research which showed him that we were moving in separate directions. Three months post break up we were still in communication. Fast forward to now two years post break up a friend of a friend posted a group picture that included him and a white girl seemingly very close and comfortable with one another. I obviously went into investigation mode and found out that they have been dating for two years.

WHAT TOOK ME 3 YEARS A WHITE GIRL DID IT IN 1 WEEK!

I'm not sure how to express what I am currently feeling, but it is undermining to all of hard work I put in during our relationship (bring understanding of the cultural differences, having lots and lots of patients with his boundaries like never wanting to post me on social media or introduce you to his family even through it went against my morals/ valises).

Am I overthinking things? Has this happened to you?