Would you be suspicious??

If your husband hasn't wanted to have sex with you lately and you came home a little late today, but driving up the street from your house was his old friend that is female that he had strong feelings for before you got with him and she even tried to break you guys up, would you be suspicious? She has no friends or anything in the area and the area doesn't have like a store or anything at all. There is no reason for her to be this way, and she knows where we live. He just acts different lately.