Playing alongside Denzel Valentine and Anthony Clemmons, they won back-to-back Class B State Championships in 2011 and 2012.

He connected on 60 three-pointers as a senior and scored 19 points in the 2012 Class B title game against Stevensville Lakeshore, adding seven assists, following a 19-point effort in the semifinals against Detroit Country Day.

His other high scoring games came against Loyola with 22 points (1/23/13) and 21 against Detroit (1/12/13), adding a season-high eight rebounds against the Titans and matching the CSU single-game record with five three-pointers.

His 15.6 points per game average led Cleveland State and ranked sixth in the Horizon League while he ranked second in the league in three-point field goals made (2.5 pg), trailing only Oakland's Travis Bader, the NCAA's all-time leading three-point shooter.

Season highs for scoring against both Notre Dame (Ohio) with 27 points (12/18/13), matching the CSU single-game mark with five made three-pointers, and Detroit (1/31/14), adding a season-high seven rebounds against the Titans.

Forbes proved his ability to play on the big stage when he tallied 22 points and five rebounds at the University of Kentucky (11/25/13), making 11-of-11 attempts from the foul line.

He wanted to come to Michigan State in part to be closer to home to take care of his young son and be near a family member with a medical issue.

Michigan State lost guards, Keith Appling, Gary Harris, and Russell Byrd.

Three post players who displayed shooting ability also left, Adreian Payne, Kenny Kaminski, and Alex Gauna.

Forbes shot a perfect 7-of-7 from the field, including 4-of-4 from three-point range en route to 18 points at Notre Dame (12/3/14).

On March 2, 2016, Forbes hit a team and Big Ten Conference record 11 three-point field goals, while leading Michigan State to a 97–66 win over Rutgers.

[10] Forbes, along with Denzel Valentine, was selected to the NCAA College Basketball Three-Point Contest following his senior year.

[20] On April 7, 2017, with Tony Parker, Manu Ginóbili and Kawhi Leonard not playing, Forbes scored a career-high 27 points to lead the Spurs to a 102–89 win over the Dallas Mavericks.

[31] On December 13, in a 125–87 win over the Los Angeles Clippers, Forbes joined Danny Green and Gary Neal as the only Spurs players to score 1,000 points and make 150 3-pointers in their first 150 games with the team.

[32] In March 2019, Forbes reached 250 career 3-pointers, joining Neal and Dāvis Bertāns as the only players in Spurs history to accomplish that feat in their first three seasons with the team.

[35] He averaged 10.0 points per game, 1.6 rebounds, while shooting a career high from 3-point range (45%) and from the field (47%) in the regular season.

Notably, he outscored Heat star Jimmy Butler in the contest to clinch the series sweep.

He had reportedly engaged in a verbal argument with his girlfriend Elsa Jean, whom he later struck multiple times.

The San Antonio Fire Department and Emergency Medical Services arrived at the scene and provided aid to the woman.

[1][2] According to police reports, Forbes entered the apartment of “an ex-significant other” – the mother of his two children – and proceeded to hit and choke her until she was eventually able to break free and seek authorities.