My boyfriend has an extremely controlling dad

I am in a long distance relationship with a guy that I have been knowing since 2017 but we officially started dating about 2 months ago. We live about 7 hours apart so of course visits to each other are very limited. So far he has came to visit me recently and is coming to visit again in a few weeks (both which resulted in a very stressful battle with his dad). He is such an amazing guy and I fell for him quickly since we already established a great friendship before we started dating. However, he has an extremely controlling father. I knew he was strict but I did not realize the gravity of it until his dad found out about me. Now he is doing everything in his power to make sure his son does not have a serious relationship with me. His dad would talk his ear off for hours instilling all sorts of negativity, even went as far as saying that I am probably setting him up to rob and harm him although he has already visited me and returned home safely. My bf lives with his parents and supports them financially since his parents are both unemployed. It’s concerning because one day he’s telling me he’s going to make his own decisions despite his dad’s controlling nature but on the other hand seems unsure whenever his dad yells at him for anything he does that has to do with me. He is in his mid twenties while I’m in my late twenties so I can’t understand why he is being controlled as if he was a kid. His dad even got angry when he saw that we both fell asleep on video chat. Sometimes I feel like I’m a teen sneaking around to be with my boyfriend but in reality I am a grown woman with kids and live on my own. His mom absolutely adores me but no one seems to be standing up to his dad… His dad refuses to meet me or hear anything about me from my boyfriend so he doesn’t know anything about me except that I’m dating his son. Now I don’t know what to do because he’s always telling me how much he is scared to lose me and I don’t want to lose him… but the stress of his dad is really getting to me and making me scared that my bf will eventually cave to his controlling ways.