Anal ouch

I love anal for starters. I’ve always enjoyed it more than vaginal sex. My current boyfriend is extremely large to the point where he ripped me open. Last night we were doing some bdsm. I was tied up and gagged so no safe words. He thrusted all the way inside me and tore my hole about a half inch. He kept going for god knows how long until he finished inside me but the damage was already done. Please please please stretch before making the same mistake I did. After a very embarrassing er visit, some dissolvable stitches, and some pain killers I can now lay sideways on my bed and pout about it.