how do you know when you're in love

I'm 17 and I finally started dating this guy who has my good friend for a few years. during those years we almost dated off and on but things happened and we would just lose track. we've been dating for awhile now and I feel like I love him. he makes me incredibly happy all the time, we never argue or fight (which I used to do with other guys I dated) we have ammmmmazing sex, we genuinely get along and always have fun, he's super understanding, and I just feel like I love him so so much. I want to know if there's any way I could find out that this is really love and not just teenager feelings. were going to the same college next year and we've talked about getting married afterwards if we are still togeher. is there anyway y'all could like tell me how to really see if this is love? 😕😅