He wasn’t my type

We met whilst at uni during lockdown. At first he wasn't my type, but both being stuck up home with kids brought us closer. We progressed, started messaging during the day, then the morning texts, then the goodnight texts. I realised I had fallen for him in February. The problem was I had a partner at home, of 9 years. We had grown apart and there were a lot of problems in the relationship, I confided in him. Few weeks later we met, eyes locked and it was magical. I left my long term partner shortly after and told him everything. He is amazing in every way, treated my like a princess, but the guilt of leaving my long term partner started hurting more and more once the affair fog wore off.