Please help me

I’ll try to make a long story short

I started talking to a guy in the beginning of the year, (I made a post about it and most of y’all said he was love bombing me) still we kept talking and aside from him being really intense I felt like we were a perfect match and decided to make it “ official “ not even 2 months later and I felt suffocated, he was talking about a wedding/ future house, dog , and made HUGE emphasis on how much I meant to him and how he would do ANYTHING for me, he always used to say the right things at the right times but there were also little things such is, he never gave me a gift, I paid for everything when we would hang out and he would always make comments about how no one was ever going to love and care for me the way he did there were also some inconsistencies so I decided to end it about a month ago I felt free and relieved as If I could once again breath, that was until 1 week ago when I found out he went on a date 1 week after the break up and that he’s talking to one of his ex, all of a sudden I feel sad and I’m not sure why, like I knew it wasn’t going to work out so why am I feeling this heartbroken, sad and lonely and even have anxiety attacks ? I can’t even sleep for more then 3-4 hours at night it is now 4:40 and I’ve been up since 3 please I need help how do I stop feeling this way 😭😭