Studies have shown that 90% of rebound relationships don’t work out in the long run so the odds are probably in your favor. There is no reason to start harassing him or the girl he is dating. Under no circumstances will you contact him. In fact, DO NOT CONTACT HIM OR HER. The further away from the breakup your ex gets the more nostalgic he will become about your relationship. This means he will forget the bad times and remember the good times.
If both you and your ex are on the same page then there really shouldn’t be a reason why you can’t go back for some fun once in a while. In saying that, this is rarely the case. In my opinion it’s best to stay away: if you’re just after a bit of fun, then download Tinder. Avoid any situations where people could potentially get their feelings hurt, no matter how little harm you think it can do at the time.
One of the most devastating mistakes you can make is trying to force it to work with a guy who is wrong with you. I’ve seen people spend years of their life trying to shove a square peg into a round hole. Everyone in their life tells them to just move on and let him go but they can’t. Why? Because they don’t have clarity or any objectivity because they are still sucked into the emotional whirlpool and have yet to break themselves free. <<<<