Father and boyfriend won't get along!

Halee
So I have been dating my boyfriend for about 2 years and him and my dad can't stand eachother. When I first started dating my bf my dad and I did not have a very good relationship, but now we are working on it and things are a lot better. But my bf won't let it go how my dad treated me when we first started dating and wants nothing to do with him. I plan on marrying him but there's no way that will happen if the two most important men in my life can't even stand in the same room together. HELP!!!!