I need help 💔

Hi guys, while I was on holiday 3 weeks ago this girl messaged me saying my bf cheated on me , but he denied it and I trusted him and believed him, but yesterday I found out he actually did cheat on me and he admitted it to me, I am absolutely heartbroken, I don’t even know what to feel , I haven’t ended it with him because he was supposed to be staying at my house lastnight anyway and I couldn’t let him go home because he’s got PTSD and he would’ve been home alone and I couldn’t let him do that with what’s happened, but waking up this morning I honestly dnt know what to do I’m still in tears , I absolutely love him with all my heart and I’m rly hurting 😭