Obviously your boyfriend didn’t make you gay.
As irrational as it is to think that one’s boyfriend made one gay, there are many parents of gay people who did just that when their son/daughter came out by introducing their boyfriend/girlfriend to their them. Those situations generally didn’t play out very well, which is why I recommend waiting for a bit after you come out to your family to inform them that you have a boyfriend. In those cases, their negative emotions about the coming out tend to be directed at the boyfriend and tend to last a long time. Otherwise, those emotions tend to go away after some time.
EDIT:
This is a sad example of what can happen when the parents blame the boyfriend for making their son gay.
As a gay man with very religious Catholic parents, I generally advise people in similar circumstances to come out alone (without mentioning boyfriend/girlfriend) and give them up to a year to adjust, introducing the boyfriend/girlfriend to them sometime in the middle of that year. If they can’t make sufficient adjustments after about 12 months (such as allowing your boyfriend to be welcome in their home on the holidays like a girlfriend would), then it would be a good time to indefinitely cut them out of your life until they do come around.