hacked iphone or mac?

i have a fear that someone (that i know) has recently gotten all of my personal info for all of my day to day administrative obligations: bank usernames & passwords, credit card usernames and passwords, etc. Although I do change my settings to be as private as possible, I fear he may have put something on my phone and my laptop because it wasn't until after he left to go back to his job in another state, did i notice my face id, startup menu, etc were all funky and had changed enough for me to notice.

so here' s my question, i frequently have to change my passwords because i forget them (i'm old) and so when i did this with one of my gmail accounts, the device "**** phone " came up and then prompted me to the device name cpu ****** which i'm assuming after reading other concerns when i go into settings: general : about : this should be the name of my device. which it's not. is this just me being paranoid?

also, how can you detect if someone has spyware on my phone. is there a specific company i can pay to "sweep" my iphone and mac, or would apple be able to help me.

any help would be greatly appreciated,

yours truly

fear of being stalked by an ex