<human>: Things with my boyfriend are great. We always have great dates. We cuddle a lot and have a great sex life. We've never really clicked so well with anyone else before and we both have long term commitment as goals.

There have been a few, I mean only a few, instances where he starts to worry about things. This is almost always after a long day at work. His mood will suddenly change and he says he doesn't want to hurt me, or wants to make sure we are able to commit to each other, and other things of that matter. Last night he started worrying he was going to hurt me and let me down, and that he loves me but wonders if he'll get bored of me and the "variety" he's used to (we both have had sex with 20ish people, and agreed many times beforehand that hooking up is vastly overrated and not fulfilling). It was weird because this has NEVER been a problem between us before. He even stopped watching porn because only me naked would truly turn him on! It was like out of nowhere and he said he needed time to think.

This morning he was totally fine. He apologized and said he thinks I'm right when I said I think he acts weird sometimes after a long stressful day. He said that of course he loves me and wants to be with me, and that I'm perfect for him. Everything is back to normal as it ALWAYS is the morning after he has a little "episode". Are these really just passing mood swings due to his work and stress levels, or do they mean something else? He NEVER talks like this when we are together, during the day, happy, etc. The pattern is only at night.

I trust in him and love him so much, but I have a nagging feeling that something like last night will happen again and he will actually leave me (he never does and ALWAYS feels much better the next morning and life is good). I suffer from anxiety and I don't want to pester him for reassurance, so what can I do? Is there anything I should talk to him about? Are these just normal mood swings/insecurities in a relationship?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: boyfriend gets weird some nights after work and overthinks things and our relationship. The next day things are fine and happy again. Is this a problem or normal?