How do i get over this?

Ive been with my boyfriend for about 2 years now and it still KILLS me till this day to know he cheated on me in the beggining of our relationship and he has lied to me multiple times during the first year as well. Things are wayyy better than ever right now but i still get sad thinking about all the crap ive been put through...hes aplogized multiple times and i know theirs nothing he can do to change it but i still get hurt...how do i moove forward ? ooh and todday he told me he has slept with 4 girls before me when in the beggining he told me he only slept with one other person..so how do i get over that too.