Well, okay. The Sunday Mass, and specifically Sunday, is an obligation, as are Holy Days of Obligation throughout the year. Regular, pre-meditated absence is not usually considered to be acceptable. You can have extenuating circumstances, such as illness, transportation, etc that occur over a time period which would absolve you of culpability, but this decision is made on a case by case basis (priest or bishop) and I’ve never heard of it being dispensed for the purposes of avoiding tension or argument with a spouse or within a relationship. Having said that, each case is unique involving unique individuals and unique circumstances. In that case, it may be “allowable” for a time.
The other issue is the issue of “giving scandal”. It’s complicated and needs to be weighed against each individual’s right to privacy, but when people realize that you’re not at Mass on Sunday, it becomes an issue of what we use to call “scandal”…I don’t have a great definition for it. It’s sort of a combination of giving offense, encouraging others to sin by example, “getting away” with something, causing tension or friction because you’re out of step. It’s not a popular notion in our current me-first, then you cultural mentality, but it has its place and to give scandal is not considered to be the hallmark of a “good Catholic”.
As mentioned prior also, “good CAtholic” is sometimes used as a euphemism for “good enough”, “no better than s/he ought to be”, etc.