Trust is the glue that holds two people together, it can be compromised sometimes yes because we are human, yes, but how we respond to those that we have compromised their trust is so important. Simple this like I am sorry, with deep remorse goes a long way. Making it up to you with action is also a good start.
Over the years I have learnt that we are all bruised human beings and we make mistakes but if it was an honest mistake, that relationship is work another try.
I figure that he has said sorry multiple times but his actions don't say so right? hence the multiple cheating.
In this case, I personally feel like you have to choose you. You have to make a choice that will make you feel good about yourself. Leave the heart out of this conversation for a moment because judging by your question, the heart is definitely ruling your relationship here.
Be honest with yourself and ask your younger self if you are really happy with where you are. the inner child will always set you free from whatever you are going through.
If you have any questions, or would like to chat, I am here to help. All the best, XOXO

Trust is the faith you have in someone that they will always remain loyal to you and love you. To trust someone means that you can rely on them and are comfortable confiding in them because you feel safe with them.
It is the building block for any relationship without which the foundation will always remain shaky.
Without trust, each moment in your life becomes a nightmare. It is difficult for relationships to thrive. In fact, a relationship without trust is simply chaotic and dysfunctional. i can brief you about the importance of trust in a relationship, how to build it, and how to rebuild it in a relationship.

If you don't trust the other person you need to move on with your life. Trust is the foundation of a relationship. If you can't trust the other person, then you are wasting your time and their time too. You are probably a wonderful person and deserve a life with trust and happiness.

The second part of the question is part of the answer. ..."you don't trust your partner because he/she cheated multiple times," tells me that cheating was happening more than once or even twice...and that you are putting the onus on you to trust your partner again. This partner has proved to be untrustworthy, and based on the question, you are still with this person. "Should I stay or should I go," sounds like what you are wondering. The fact is, this partner cheated (multiple times) and you've stayed. Since this question is filed under "Self-confidence," it seems as if staying is a confidence issue for you more than a trust issue. My questions would be: Why would trust need to be repaired by YOU? Why are you placing more stress on your lack of trust than the fact that your partner cheated multiple times? And, do you have an exit plan? I work with people leaving or who have left toxic relationships, and the one thing they always need is a plan. Please reach out so we can work on deeper self-confidence goals together.

Much love,

Nicole

In this case, the best option would be to end the relationship. If they have cheated multiple times, it shows you that they dont care about you or your feelings. its hard to accept that your partner doesnt have enought decency to give you even the bare minimum of being loyal but if you really care about yourself, you should make the decision and leave the relationship because you cant make anyone change.