Hi sar112,
Stay strong, you will be fine and so will he! Sounds like he’s unable to take you off his mind. Being a dude myself, I remember when I got dumped and a few days later I had this urge to send all these pics of the places I was visiting and groups of friends I was hanging out with having a blast. luckily a friend of mind who was aware of my situation saw me composing a msg with a few pics and she told me off (lol)
If he initiates a rebound, instead of being upset, see it as a blessing. It may just be what he needs to realise what a truly loving and amazing person you are.