Knight of Pentacles reversed indicates that there are difficulties in dealing with the situation, but there is also a chance to overcome it. This card can indicate that it is not a good idea to hold onto resentment, especially if you plan to forgive your partner. The Knight can also represent advice to take things slowly and move forward, so that we can get through this difficult period.
Seven of Wands reversed shows that there is some doubt and uncertainty about the situation. It may be difficult to decide whether or not to forgive your partner, but it's important to consider all aspects of the situation before making a decision. The Set of Wands can also mean that there are circumstances you haven't considered, so you need to do some further research before making a final decision.
The Tower shows that, in your situation, it is important to know the way things really are, as you can easily be misled by false information or wrong opinions. The Tower can also represent the importance of finding the balance between heart and reason in making a decision: forgiveness requires a lot of courage, but sometimes it is the only way forward to overcome difficulties and restore peace in the relationship.
Taking into account the cards mentioned above and the orientation of the cards, it seems likely that the answer to the question "should I forgive my partner for a betrayal?" both yes. However, before making a final decision, it is essential to understand all aspects of the situation and to find the balance between heart and reason.