frustrated that my gf doesn’t want to be intimate before or after a trip

My gf 20F & I 21M have been together for 3 years. Our sex life was very good for the beginning of our relationship, & ended up kind of just plateauing. We have had many long talks about the subject, & it’s been hard. We are very intimate outside of sex, cuddling, showering together, I massage her often. She has expressed that she just doesn’t feel like sex is as important to her as it is to me, & that she could go without out it if it came down to it, she said she doesn’t want to do that but she could.

Im a recovering pornography addict & have been clean for a long time, but know that my brain still hasn’t recovered, I don’t have a healthy relationship when it comes to sex & I am working on it in therapy.

That being said, there’s something that makes me really really frustrated about this all. My gf likes to travel a lot & recently went on a trip with her family. The two days up before the trip we had no intimacy. She was gone for a week and a half & got home & she said she’s too tired to. This specifically makes me feel physically upset like a pit in my stomach. She doesn’t care about it that much that she doesn’t want to when she’s leaving for a week? Or didn’t miss it at all enough to want to be all over eachother when she gets home? It’s frustrating and hard knowing how different we are.

Those with a lower libido if you see this, I would love your perspective on this. It’s just really hard & i’m doing my best to not be the entitled boyfriend that makes his partner feel like they owe me their body. I’ve been holding this frustration in because I feel like it’s wrong. If anyone has any advice on the subject please chime in.

TL:DR- my gf went on vacation and didn’t want to be intimate before or after the trip. it makes me feel unwanted that she doesn’t think about it or want it while she’s away, but I feel guilty for being frustrated, any advice would be appreciated.