A movie
Sign up for a weird class that looks marginally interesting
New exercise: Zumba, bikram yoga, spinning etc
Cooking class
An interest course ( like art history etc)
Book club
Hiking club
Learn something or do something that puts you out of your comfort zone
Volunteer

All these things where you can meet new people. Try asking your friends about some activities

The more stuff you do, the less time to think...trust me lol