Would my ex (now talking stage) be mad about me and another guy?

so my ex and i are talking again and i lied about being experienced.. and my guy friend and i who are pretty close would say sexual stuff towards eachother but i only meant it as a joking way but he was very serious, and we had sent to eachother too. i said that i would suck his dick one day but this was all before my ex and i started talking again. And he had told me he loved me and all this. but i know if i gave my homeboy head there’s a possibility that he would tell people and my ex would find out. but he said if my ex and i do date again he won’t ever talk to me again and we won’t be friends anymore. so do i give him head then lock in with my ex or do i just stick with my ex?
Would my ex (now talking stage) be mad about me and another guy?
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