At the expense of having a fulfilling, adult relationship? I dont think so. A trip once a month is reasonable, even every other week might be reasonable. Hosting his parents at their home occasionally is reasonable. His driving there every single weekend is unreasonable.

I agree with a previous poster, some nights during the week Im so tired and busy and swamped from the work day that I can barely remember if I saw my fiance, much less spent quality time with him. If we had no weekend time to reconnect and do fun stuff and actually have time to talk, we would have broken up long ago.

There is nothing juvenile or immature about staying close to one's parents and family. There is something juvenile and immature about using that to avoid intimacy with an adult partner. This clearly has crossed the line and fallen into that second circumstance.