I signed a separated agreement but me and my husband has been together but live in separate houses

Isolated incidents of sexual relations to not void the separation. You can file an action for specific performance to enforce the terms of the Agreement. Consult with a local family law attorney for more detail

Depending on what you agreed on, you can likely hire a lawyer and pursue your case in Court. If you have any specific questions about how to enforce particular terms of your agreement, I'd be more than happy to answer those questions. Without knowing any of the details of your agreement, or what your husband is not doing, it's hard to give helpful advice.