in a match Chelsea v Manchester City I predict that the scores in this match is under 2.5 goals, and I probably would expect Chelsea to win this match, so I'll bet for Chelsea in this match, because I know that Chelsea can beat Manchester City

Nah man, both teams have a same change to win on this match. And i have bet on Man City ML. But i agree with you on under 2.5 goals, i predict 0-1 win for Man City.
both team have target to win in this match. But if see Chelsea's condition , maybe Man City winning chance is bigger and i will bet for Man City ML too
Chelsea are not in form in the last weeks. Also their players will not be motivated, because there is nothing to fight for. Meanwhile, City are still fighting with Manchester United for a place in top 4. Also they are in very good form in the past games, so I expect their positive performance to continue.