You have sounded so happy lately. Yay!
There's no reason to reconnect with Seven even if Lamian has left him. For one thing, she'll probably come back to him (they seem pretty co-dependent). For another, even without Lamian, Seven will still be Seven...emotionally immature and selfish.
Keep doing what you're doing! Forge new relationships and a new life!
Single, straight, female, solo, non-monogamous.