This kind of things takes time. If he rushes it, it means that he doesn't want to invest his time in you or has something to hide.
You felt rushed by his "lovebomb". Trust your gut.
Anyone can stage a photo. Don't read too much into it.
You'd feel guilty if rejecting him outright. That indicates you have empathy, maybe too much of it. You attract people who have narcissistic traits. Value yourself more so you will not feel hard to say "no".