Got stood up and dumped?!?

Sh
Okay so I was seeing my boyfriend for 4 1/2 months and we decided to go out on a date for the 4th, he ended up blowing me off and leaving me alone at the boat dock for 3 hours. I had to get my dad to come pick me up because my car is in the shop..ontop of that he texted me at midnight to tell me he didn't " feel it anymore.." And by this morning he's in a new relationship already?!?