I think my boyfriend is using me...

Hey ladies, so today has been quite rough. I slept in pretty late and that's very unusual for me. My boyfriend asked to borrow $260.00 so he could flip it and I said yes as long as I get it him before May. Well when he got off work he just started treating me like dirt. No reason and I haven't done anything wrong. I know he might just be tired but I feel unappreciated but keep in mind we both take Adderall for our A.D.D and I read up on it that it changes your personality and your moods sometimes and I am on my period so I'm probably just overreacting. I'm not sure if he is using me but what tips could I do to find out if he is or not? We have been together for about 1 1/2.