Answers

The girls must love the man.

Both girls can't be his wives.

He must be rich.

He can't be disappointed.

He might be a grandfather.

He might have given the girls a present before the kiss.

They must have quarrelled a few minutes ago.

They may/can/might split up if they don't solve the problems.

He may/can/might be jealous.

She may/can/might be hurt.

They can't be too happy right now.

He might have cheated on her.

They may/might have a child.

She must be very sad now.

She must have had a bad day.

She can't be married because she doesn't wear a ring.

She may have had a fight with her boyfriend.

She might want to talk to somebody now.

She can't have heard good news.

She might need help.