<human>: My father and I have had a rocky relationship but I can't ever really stay mad at him for long. He's battled a very bad drug addiction, jumped from relationship to relationship after he and my mother split, and has moved further and further away from me without letting me know until he's already purchased the property. Someone may recall a previous post of mine where I found out my father was engaged to his 27 year old girlfriend by her posting it on Facebook. 

Anyways, my boyfriend and I went out to visit my dad (he lives in a different province now) and had a lovely visit. I thoroughly enjoy spending time with my dad. During the trip, my dad kept dropping hints about my boyfriend and I flying out for Christmas at his expense. Christmas is easily my favourite holiday (I am one of those crazy holiday loving people that decorate the entire house, even Christmas toilet seat covers) and I've always spent Christmas with my mom. My boyfriend also has Christmas obligations however he told my dad that we might go out to see him. I know my boyfriend was just trying to be nice but I kind of wish he didn't get my dad's hopes up. My dad has asked me several times over the years while he's been on his own or with new girlfriends that he wants me to spend Christmas with him. 

I feel really bad because I love my dad but holidays to me always mean my mom. My dad means well but I do have some lingering issues from him leaving my mom on Christmas Day for another woman, all of the times he has disappeared to do drugs and just never showed up, etc. 

I told him that my boyfriend and I have prior engagements but that isn't really doing much. He keeps saying that it would be nice for us to finally spend Christmas together, etc. 

How do I let him down easy?

Give me a shortened version of the text
<bot>: My dad always thinks everything is peachy and expects me to fly out to see him over Christmas. Need some advice on how to let him down easy.