Boyfriend of three years has been cheating in me

Idk what to do I’m 18 currently living with him I’m packing my bags in my car I looked in his computer and found out he been meeting with this girl that Ik something was going on last year I don’t know what to do he was literally my entire world my first and only bf idk where to go this was my whole life 😪😪😪😪😪😪😪😪