I feel like cheating

My husband is always accusing me of cheating, although throughout our 5 yrs together, ive never cheated on him once. He said i cant control myself, which he is 100 percent wrong about that. I found out that he was the one cheating on me, and now i feel like i want revenge, by cheating on him back. I cant leave him at all, we have 3 kids under the age of 3. Idk what to do anymore, i feel like cheating on him.