Is this weird?

Do I have a right to be mad? my boyfriend has told me, specifically, that I'm the only girl he's ever been with because no one has ever wanted to date him. I've told him that it isn't possibly true but he insisted it is. two months later and he has a disagreement with my friends and he says all of his "other relationships have failed" because of people getting too involved in them.

So he lied to me? I've been open with him from the beginning about my other relationships, so I feel he should've been too? am I overreacting? 😕🤔 I just find it a bit odd... like, why did he feel the need to lie about something like that?