I need help… dont know if im in the wrong here?

So i was talking to a guy for about 8 months! we were in no relationship but it did seem like it to the point where he met my family and i met his. We would literally see each other everyday, he gave me a key to his apartment. I can honestly say i fell in love with him. He was in the military and was very depressed bc he lived alone and his family lived more up north so i saw him go through his depression and tried my best to be there for him. He was in debt and also owed rent money. He was to the point in which he had no idea what he was gonna do and was probably gonna get kicked out. Me being the type of person i am, i really care a lot about my people. and i cared for him so much. I let him borrow about 400 to atleast pay off the rent money he owed. He didnt want to take it but i insisted and he did and i told him to pay me whenever he could. Our relationship was never official bc he would tell me that he was not able to be with someone just bc of the situation he was in, he couldnt give himself to another person. he said he really liked me and if i was willing to wait for him which i did. however….. i found out the whole time he was messing with another girl that was his sister’s friend. i found notes and stuff of her at his place since i would stay at his place once in a while. i told him to tell me the truth if he had someone else in his life and he said he didnt. when he lied to me knowing the stuff i knew, it was certain that he clearly didnt care at all so i confronted him again and he finally said he was dating her. at that moment idk what was going through my head but i was very much heartbroken. i cried so much that night wondering why i wasnt enough. he ended up tryig to flip it on me saying “why was i acting like a victim if he was honest the whole time” which clearly he wasnt. and that moment i was just done. he wanted to be friends but i told him no bc how can i be friends with someone that literally drained the soul out of me. i had never been in a situation like this and wouldnt sleep at night just thinking about him. its been about a little over a month that we havent spoken and i feel like im finally feeling better and moving on. my problem now is that i need my money back not bc im in need of money but, i know u never really find closure, but just knowing that there’s something like him owing me money keeping us connected i want that connection to break. i dont want nothing to do with him. i had already texted him and requested the money on venmo but he blocked me from venmo and never replied to my text. so idk if i should keep insisting or wait on it or idk…? i need some advice._.