<human>: Sometimes I think my SO (M[26]) takes advantage of my (F[24]) time. We're dating long-distance, and hardly ever get to see each other. A family member he's close to is coming to visit for a month, and he wants to give up one of our scheduled visits in order to spend more time with this person. This isn't the first time he's bailed on one of our visits. The last time was two months ago, due to a scheduling miscommunication. I understood it was a mistake and he was stressed out and let it go. Now that it's happened again I'm wondering if I'm being too much of a pushover, and when do is the appropriate time to stand up for myself? On one hand, I understand him wanting to spend time with relatives, and I don't want to deny him that. But on the other... if he doesn't visit then we won't see each other for another two months. 

We saw each other briefly on Thanksgiving, so promised to visit me soon. Well, soon is here and he's trying to back out. What to do?

Summarize the given text in a few sentences.
<bot>: LDR boyfriend's trying to back out of a visit. Do I speak up or let it go? Dating for almost 2 years.