i don’t know how to feel

so in august i was 16 and i started dating this guy that i didn’t know beforehand and he was 18. we talked for a while and we were originally just going to have fun and hookup but we ended up dating and really likening each other. after the first date he told me he loved me which was weird and i didn’t say it back but we continued dating. he met my family and we hungout quite a bit. we never did anything sexual for the 3 and a half months we dated. we only kissed but he kept expressing how much he wanted to have sex and do other stuff. anyway at the end of december he said he just wanted to be friends so we were but we really didn’t talk or anything then in february we started talking again and we ended up having sex a few times. at this point i am 17 now. one night after we had sex he said isn’t it crazy that im turning 20 this summer. i was so confused and thought that i must have misheard him but later i realized that definitely is what he said. i was so confused and honestly felt a little gross but i loved him and i couldn’t leave. i know this is dumb but i got mad at him for lying and he denied it at first and said he would never lie and even swore on his life. eventually i got him to fess up and tell me he lied at first but told told me he thought he told me he was 19 because he felt guilty about lying but he never really did tell me. im so confused because i stayed and had sex with him and i just feel dumb. but i really do love him. we aren’t talking right now after he kept saying he would make time for me but never actually did. i want him back so bad but i know i shouldn’t. i have a huge history of being careless and dumb when it comes to my well-being because i just don’t care what happens to me. i just really want to hear someone else’s opinion on this.