<human>: Summarize the given text in a few sentences.

For the first year and a half, everything was wonderful. I was introduced to his family and even invited to some family events. Then all of a sudden, the invitations stopped, and it took me a year to realize that now this was a pattern. 

About four months ago, I brought up to him how I felt excluded with his family. He gave me an ultimatum. Either I had to deal with it or leave him. Of course I said I'll just have to deal with it.I eventually learned that his mother was uncomfortable with the idea of him having a girlfriend. And that this probably will not change, unless we get engaged ( not having for at least 5 years ). The thing that bugs me is that this is a cultural difference, and I'm trying to respect it. I do respect it. But also, in my culture, one is expected to be having Christmas dinners with your SO's family after 3 years.

However, I consistently wonder what it is like to be accepted in your SO's family. New years, (almost Christmas), valentines day, are examples of holidays that I couldn't spend with him because he was spending it with family. We are long distance, so being able to interact with him and his family would allow me to see him more.
<bot>: A relationship is between you and your SO; however, your SO's family is also a big part of it, right? His family hasn't included me in anything for about 1.5 years.