My LDR partner broke up with me...

Long story short, he broke up with me 3 weeks ago. He had already booked a flight to see me and hotels etc so we decided to meet up as friends and will meet this monday for a short holiday together. We hated for 11 months and I have never fallen so hard for someone before. I've gained weight and he has only improved his physique so I'm very anxious about that too... He posted a picture online of him wearing a tshirt i bought for him for Christmas ( very soppy shirt haha) and it really tugged on my heart strings. I thought I started moving on from him but seeing that brought me back to square one... any advice? :(