How to deal with heartache like this?

If you and someone else was deeply in love with eachother back in hs.

You used to date eachother secretly because both of your parents wouldn't approve of ya dating someone.

After sometime, you both had to end it because their parents found out about ya.

So you both made a vow to wait till you both graduated college and could get a place together and openly date.

You thought ya both kept your vow to wait for almost 5 years, until last night, when the other person tells you they met someone else and has been dating them now for a month.
How to deal with heartache like this?
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