Real Meaning of Quote

Act 2: Scene 3
Prompt C:
Friar Lawrence says,
"Is Rosaline, that thou didst love so dear, So soon forsaken? Young men's love then lies Not truly in their hearts, but in their eyes. Jesu Maria, what a deal of brine Hath washed thy sallow cheeks for Rosaline! How much salt water thrown away in waste To season love, that of it doth not taste. The sun not yet thy sighs from heaven clears, Thy old groans yet ring in mine ancient ears. Lo, here upon thy cheek the stain doth sitOf an old tear that is not washed off yet. If e're thou wast thyself, and these woes thine, Thou and these woes were all for Rosaline.And art thou changed? Pronounce this sentence then:  Women may fall when there's no strength in men."

To me this quote has a lot going on. The friar is telling Romeo that he says he loves Rosaline but then now wants to marry Juliet. Romeo is a young man that does not have his feeling straight. He cried and bawled for Rosaline not loving her, and now he is as happy as can be. He wants to know why he changed his feelings so fast. He finds this whole situation as evidence on why people do not have confidence when it comes to men loving.