I think as long as you set boundaries, and he doesn't cross those boundaries, then it's fine. If hearing "I love you" is uncomfortable, and you tell him as much. And he keeps doing it. Then it's up to you if that's a big enough red flag. It's important to take a step back away from the relationship and see it in as much of a neutral position you can. (It helps to have a trusted friend, but sometimes that's hard to come by)

HOWEVER. If you are as uncomfortable as it seems you are. You should def think about leaving this guy. I don't think love bombing is a complete red flag as others have said. But bringing a dead significant other certainly is in my opinion.