16 F 17 M sister was cheated on by boyfriend and got back together after a month

Sister Got Cheated on and accepted him back

A month or so ago my 16 year old sister was cheated on by her 17 year old boyfriend. Not a big deal they’re kids it’s gonna happen. They got back together after a month and are trying to move past it. Anyways today my mom, dad, sister and her boyfriend went out to eat for Father’s Day. The boyfriend ordered the most expensive dish being the oysters which were $30. My parents paid for the whole thing.

I am 20 and will usually order something cheap and throw some money in on the tip. Just trying to be considerate. He ordered the most expensive thing then said after it came that he didn’t mean to order it that big.

Having dealt with people like him a lot I feel like he’s taking advantage of the opportunity and ordered that on purpose to take advantage of my parents. Now my opinion is they shouldn’t have paid for it and shouldn’t have accepted him back into the clic. At least not after a month.

My question is for any parents would you accept your daughters SO back into their and your life after they cheated on them?

If you were in my shoes how would you go about interacting with him especially if his actions make you feel some kind of way? Would you accept him back easy or feel somewhat bitter?