Another girl sucking your bfs dick

My bf told me Tht he thinks it's not technically called cheating if another girl sucks his dick. He claims Tht he's not having sex with her or doing anything else it's just pleasure. To me I consider it cheating the other night I believe he was joking but he's like babe can I get my dick sucked by her I said ur an asshole. Yes I do believe he shouldn't do Tht can someone help me figure out wt to do n do u believe it's cheating?