Cho anh ấy thấy rằng bạn đang tận hưởng khoảng thời gian tuyệt vời khi không có anh ấy. Khiến anh ấy ghen (không bắt buộc). Làm anh ấy ghen trên mạng xã hội. Bắt đầu gặp gỡ anh ấy. Cho anh ấy thấy là bạn đã thay đổi. Tìm kiếm dấu hiệu. Bắt đầu hẹn hò một cách chậm rãi.

Given the above summary, write a detailed text in English for it.
After enough time has passed and you feel that you both got some perspective, you should start giving your ex the opportunity to see you having a great time. Starting going to the parties where he goes, or run into him with a friend at his favorite coffee shop or bar. Don't be too obvious about it, but let him see you with your other friends and remember how much fun it is to hang out with you.  If you know you'll see him, look your best without being too obvious that you're dressing up for him.  When you do run into him, greet him with a smile and a surprised look -- you were so busy having fun that you didn't even think about the possibility of him being around. This doesn't work for everyone, but if you think that having your ex see you with another guy, or just flirting with a group of guys, will make him want to be around you even more than go for it. This doesn't mean you should get another boyfriend just to make him jealous. Just let him see you flirting, tossing your hair back, or even getting on the dance floor with another guy or two. Don't go too far with this one. If he thinks you're actually dating someone else, he may back off. Or who knows -- that might make him want you even more. Without being too obvious, post some photos of you having a great time with your friends, you at the beach, or even you hanging out with a few guys. This will make your ex remember how great you look and feel sad that he doesn't hang out with you anymore. Don't post anything too often -- just once or twice a week to remind him of how amazing you are. Pick a time when you know he's likely to be online -- if you know his schedule, you'll have a sense of when he's most likely to look at your pics. Start making your relationship a bit more friendly. Move on from the casual hello to a short conversation, and then even stick around and chat with him for ten or even twenty minutes. Make sure you always say goodbye first, though, and don't make him linger longer than he wants to. This will make him even more sad to see you...