i feel uneasy when my husband talks and being friendly to his ex(s). i know that he is just trying yo be a good person but i still feel like it is wrong

i can say its all because i was being cheated on my ex. he was really overprotective, he asked me not to maintain any friendship but then he cheated on me. since that day, i have a big trust issue, which also happen towards my husband. i feel bad for him but i dont know how not to be like this