Susan Gibb finds another disclosure, this time by Grace

GRACE
In college… I was in love with someone else.

TRIP
What?!

GRACE
An art major, named Vince.

TRIP
An art major named Vince —

GRACE
And…

GRACE
And I slept with him.

TRIP
Y — y — you what?

AUDREY
Grace, don’t say any more

GRACE
The night before you proposed to me.

GRACE
I jinxed our marriage, Trip.

GRACE
I jinxed it. I’m sorry.

GRACE
This is all my fault.

In this case, it would seem, Grace was in love with Vince and Trip when Trip proposed and thus feels that sleeping with Vince betrayed the other lover thus her use of the word jinx. She is troubled by guilt. We don’t know how many times Trip proposed, though. Grace doesn’t tell us that she accepted this particular proposition or if Vince ever proposed himself. She makes love with Vince the day before Trip proposes. But I wonder if Trip was ever aware of Vince now that Grace brings it up.