Is it possible to forget how to be in a relationship?

I'm seeing a guy who has not dated in 5 years. He plays video games all day until 2-3 am. He does run errands and takes care of things that need to be done. But when at home he just plays on his ps4. The only time we have is an hour or 30 minutes before he wants to go to bed. During the day he takes care of his son who is 7 (while playing games) and I have a daughter. But she is 13 and doesn't need as much care. I don't feel like I can talk to him because he said the last time I visited a few days his routine was thrown off his anxiety was triggered. I do love him because he's been with me through some horrible things most guys would have run from. But it's just not enough for me. The relationship is new but it feels like when I was in my 17-year-long marriage. I know it will crush him. But I feel like I need to break things off so he can work on himself.

Is it possible to forget how to be in a relationship?
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