I cry at the opening of nearly every children's movie because the soundtrack is orchestrated to pull my heartstrings. That doesn't mean that has any big emotional relevance for me.
Three months is a short period of time. Maybe this guy felt love for you, maybe he didn't; maybe he was just feeling those words out because he's learning what they mean to him. Who knows. But love doesn't necessarily create feelings of exclusivity. People are usually still attracted to other people, even when they have romantic love for someone else.
Not knowing the history of this relationship, we can't say much about if you should pursue it again or not. But if you need extreme faithfulness in word as well as in action, it's pretty clear you're not going to get it (though did you two have an agreement? If not, he may have had no idea what your boundaries were, and that's not really his fault ). If what he said was offensive to you and he can't respect that or can't live with those boundaries, then no, this likely isn't a good partner for you.