I would say this is something they need to talk about and work out together. They need to figure out the boundaries of what they are willing to do, and see if they are both ok with that.
If he is not willing to give on it, breaking up with her might be a better plan. If he isnt willing to do what she wants, or if he does it but is unhappy about it, sex and intimacy will become a bargainaing chip, a way to get back at the other etc.
They really both need to be ok with where they are physically and decide together when that should change.
If he wants to make it work:
Don't spend lots of time alone together, that just makes it harder, and puts temptation in your path.
Spend time talking on the phone, talking together, walking together, holding hands, things that generate non-physical/sexual intimacy.
Set definate boundaries. Waiting until you are in the moment to discuss how far you are going to go this time is dangerous and stupid. Be prepared to be strong, and set boundaries while you are both clear headed.
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Everyone who thirsts, come to the waters; and you who have no money
come, buy and eat. Come, buy wine and milk without money and
without cost.-Isaiah 55:1
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