can you be in love multiple times?

My boyfriend has told me before that he loved a girl he was with in the past. He always says he loves me. I have seen his past messages from before we dated about how he loved his ex gf before me and was deeply in love with her. Last night we were watching something and I said that I don't believe someone can fall in love multiple times. He said he agreed but couldn't give a reason why when I asked. I asked just to see if he was agreeing with me just so no argument or he actually thought that.... so do you think it is possible for someone to be in love many times? Or is it they think they are in love? I'm sorry if this is confusing...

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