I don't think there is any normal, and anyway what does that matter? You feel what you feel, and everything you feel is valid. This has been a horrendous shock and you are trying to process it.
Before this happened, what were the things you did for your own well-being? The things you need to take care of yourself and keep you in good health, your maintenance strategies. Are any of them things you can still do during lockdown, ie walks, yoga, creative practice of some kind... I'm just thinking that focusing more on what you need, throughout the day or night... so every time you start to wobble or get caught up in despairing thoughts, you stop and say to yourself, 'right what do I need?' A glass of water, a jog round the block, a massive cake, a phone call with a friendly voice, whatever it might be - 'what do I need, right now this minute?' Focus on your needs now.
You can reduce the time you allow yourself to think or focus on him, his behaviour, his perceived thoughts or intentions by keeping it to a specific time of day, for an hour.
Other than that try to stop going down that route if you possibly can. Self preservation here is important. Self care. Focus on you. Not him.