Is it wrong to conceal information from my father while I live in his home?

I am a 21 year old gay college student still living with my parents as I pay my own tuition and progress through college. Both of my parents know I'm gay. My mom is completely fine with it; it's a sore subject with my dad and it's something we don't discuss. He threatened to kick me out of the house when I came out but then recanted because (I think) he's wrestling with the morality of the issue. Two months ago, I started dating a really wonderful guy. He comes over often and sometimes spends the night. My mom knows we are together; she is happy for me and approves of my relationship. I haven't told my dad for fear of being kicked out. My dad specifically told me that he "did not want that kind of activity in his home." I understand that it is his house (as well as my mom's, who doesn't have a problem with my sexuality), and I try to keep things low-key whenever my boyfriend comes over; I also try to spend as much time with him away from my home as possible. But. sometimes I would just like to sit down in the comfort of my own room and watch a movie with him. I think my dad would kick me out if he ever thought there was anything going on between me and this guy he knows only as my friend. Am I obligated to tell him about our relationship? Doing so may result in me having to couch-hop until I find a suitable dwelling. It may also make it impossible for me to continue paying my own tuition, a thing I'm quite proud to be able to do. Living at home helps cut a lot of expenses to make that possible. But, is it immoral to lie to my dad about my relationship? I am planning to move out after my bills for the semester are paid and I can save up enough money to afford the down payment on an apartment or house. I will not be keeping my relationship a secret from anyone after that. But, until then, do you think it is immoral to continue lying? I do not understand or sympathize with my dad's aversion to my sexuality. He's told me once before that no one else can know, because it would bring embarrassment to him. I think that's second-handed and irrational. My sexuality has no bearing on anyone but me. Still, I feel like I have to lie to protect my own interests.