28 UK. I cheated last weekend

Hi
Just wanted to post this so I can get it out and just get it off my chest.
This weekend I let things go a bit too far and ended up sleeping with someone else.

Things have been very up and down in the bedroom lately, and sex has become very very routine and nothing like it used to be like.
My partner is older than myself, with no issues in the bedroom, though he's been very busy with work over the last few months. I'm not trying to many excuses for him or myself.

The other night I was with someone close, I was a little tipsy, but it was one of those moments where the other person is just saying the right things and I just felt very wanted and gave into it. I won't get into details here, but in the moment it felt like ecstasy.

My husband is away this week but I have no idea how to deal with this. I think I've unofficially ended our relationship just because I was horny 1 night.

Anyway, I've got to go and cook dinner. Thanks for reading. I'm ok to chat if you want to talk or share advice