I'm thinking of signing an apartment lease with someone I'm suspicious of.
Why do they give you a funny feeling?
I'm not sure, but I have a bad feeling about them.
I'm sure you want to trust this person but if you are suspicious of them, you shouldn't sign a lease with them. It's best to not get into an agreement with someone that you don't trust.
But I just want to keep my options open.
I would just find someone else to lease with if you are already feeling suspicious of them. You should probably avoid them.