: to make love frivolously or in a trifling or fickle way : DALLY, FLIRT <belles and beaux philandered in the big hotels -- Van Wyck Brooks> <his penchant for philandering with pretty stenographers finally drove his wife to sue for divorce>
"To philander" is a rather strong word.
I can't think of a good equivalent for "tico-tico no fubá". In fact, I don't know when such a question would be asked. It's very personal and many would find it offensive. On Facebook you find "complicated". That may be a good choice. It's vague, not personal, and can be interpreted in many ways. A better way to ask this question is "What is your marital status?" Possible answers include: married, single, divorced, widowed, "living together", and common-law. ("Common-law" is not recognized in all states.)