Yep. It can be too early to forgive. But all in all, forgiveness is important. As is apologizing. But when you do apologize, do it right away, don't wait six months to apologize to your ex just because you and your current partner just split. It makes it seem a bit fishy..
Bonus: Don't tell someone you still care for them after ignoring them for [insert period of time here]. It's dumb and makes you seem like you don't know what you want. Maybe what you need is a nice long break from relationships.
Apologize and mean it. Forgive when it's deserved. You only have so much time. No regrets.