Looks like he has ick, I would begin with a 100% water change, wash his bowl and accesories with hot water only (never use soap) make sure the new water has dechloritaor in it to take out the toxins in tapwater and make sure the water temperature is the same as his old water. I believe ick comes form not enough water changes. A one gallon bowl should be given a 100% waterchange every three days.
Now, look under the pinned thread for betta illnesses and see if the ick describes what you see, then treatit according to their directions- good luck he;s cute :(
every two weeks is not enough for a bowl that size, so that's most likely the root of the problem.
What happens is fish secrete ammonia and it comes from their waste and the food they are fed, this ammonia is deadly toxic to fish and is invisible, it builds up unseen, so even though your tank may look clean, it is surely not, even worse it could be causing damage or even death to your little guy, so be sure to make those water changes more frequently, once every three days for a bowl that size is the longest you can go!
thank you so much for the tip, i will clean his bowl and treat it. the only thing i am worried about is it going to stress him out if he is not used to me changing it that offten? or will he adapt to the change for the better??
some say salt and warmer temperatures gets rid of it, but i use the Jungle brand ick tablets. turns their water blue, but clears it up fast. Cup had a mild outbreak not too long ago, and the ick tabs knocked it out in a day or so.
changing temps can cause ick to occur, as can stress. get him one of those new Betta Bowl heaters they started selling, sense that's about all that'll fit nicely in a bowl. in a tank or bowl that size, water needs to be changed every three days or so to keep things nice and clean.