Going out? with another guy? and not telling you? Uhhh, I don't think so.
Doesn't matter how much trust you have for the person, you should STILL be worried.
If my boyfriend did that s**t to me, im sorry, but no. The answer is HELLLLLLLLLLLL no.
I mean, I understand you trust him, that's a good thing, but you cant EVER fully trust ANYBODY but yourself, not even your family members.
You have to put your foot down, or else he is going to keep doing this.
You have to tell him straight up what you like and what you don't like, and if he doesn't understand, then he isn't worth it. Ask him how he would feel. Always tell them to put themselves in that position, cause it works sometimes.
If you know you deserve better, then leave him.
Seriously, leaving someone like him is just an opportunity to meet someone better.
id say he is more interested in this other guy than u. make him want U more than the other dude. Then he might go to u instead of that other dude. Might work. U should lead him on instead of him leading on him.
As much as it may hurt you, I think you know you need to do.
If he's going to be doing things like that while you're in a relationship with him then he's probably not worth your time.
It'll hurt in the short run, but you could be a lot happier in the long run.
I think it is already clear to you that his behaviour is not ok. He is cheating on you and is clearly inexperienced at doing so. This is typical behaviour for cheaters to try and make you feel ok with it, lying to you about it to get to that goal, and it never ends well. I think you know already that you should do one of two things:
1. Leave right now and don't look back.
2. Give him the choice: you or the other man.
While you might lean more towards option 2, since you've had such a long standing relationship with this man, I ask you, OP, would you really want to spend the rest of your life with a cheater?