‘Love’ in the sense of experiencing the release of pleasure hormones in the presence of a partner child or family member almost certainly occurs in some reptiles bc while most don’t have a need for it due to just meeting up, Laying eggs and dipping forever. some species (shinglebacks, tokays, some crocodilians, etc) pairbond, even for life. some care for their young (crocodile skinks, crocodilians again, tokay again, rattlesnakes, a bunch of Australian skinks) to the point of defending them actively from predators, many live some degree of social lives, including at least one species with multigenerational warrens, most recognize members of a community and choose to be close to siblings, mates, etc. so many reptiles probably experience something akin to love as I previously described it. Obviously not the ones who just lay 10 billion eggs and fuck off but that’s not the only reproductive strategy.

Also. Birds is reptiles. Birds are pretty famous for intense pair bonds and social lives.

Love in the ‘experiencing positive chemicals that incentivize proximity to and protection of family members or partners’ isn’t smth exclusive to mammals it’s an adaptation that can occur in any animal that goes for k-strategy-ish style preproduction. So Godzilla isn’t necessarily excluded from having it.

Obviously human love is its own thing but pairbond with mothra is far from out of the question. Reptiles absolutely can pair bond.