Do not share any of your personal life experiences with your supervisor. Your supervisor is not your friend. Keep things professional. If things are shaky between the two of you...
Using HTML for design is a tad obsolete and clunky nowadays, but it'll work for the most part. However, CSS, is the better way to go. font-style: Italic; would be...
If you suspect a co-worker is stealing definitely tell your boss. Make sure you have good reason for accusing them and aren't doing it just to get them in trouble...