If my ex-boyfriend was 18 the first time we had sexual intercourse and I was/am 15, would he get in trouble if my parents chose to press charges and if so, what would the punishment be?

The age of consent to have sexual contact is 17. That said, it would be a violation of state law for an 18 year old and a 15 year old to have sexual relations. If an 18 year old has sexual contact with a 15 year old and the parents file a complaint with police, there would likely be an investigation. The 18 year old may be found in violation of state law under chapter 38 Article 11 (sexual offenses). This could be a misdemeanor or a felony charge depending on the circumstances. There really is no good way to accurately estimate what the punishment might be. This would be up to a judge and would depend on several factors.