I need some serious help😭😭

Alright so I’m dating this boy.. let’s call him Alex. So we have been have dating for a year. But we recently broke up December.. there was another girl and we will call her Liz. He went through a rough patch during that month and Liz was there for him only a week and half. He started liking her. We just started talking again.. he says he loves me and he wants to be with me until he future and that there is a difference between like and love.. but to me if you love someone you should only be crazy for them. He told me that he will just push his feelings away and he will be over her soon but what about other girls in the future.. what do I do.. I was there for him for 12 months.. she was here for a week and half when I wasn’t available..