Husband crossed the line during boys' night out?

Sorry it's a bit of a long post but I need to get this off my chest. 
So, Its been a fairly difficult pregnancy but finally we are almost there. My baby is probably coming within this or next week. I gave my blessing to my hubby's request for a 'last hurrah' boys night out before baby comes. We went out together during the day and came evening, we went our separate ways. He with his boys and me with my girls.
He came home smashed but that was well within my contemplation. He probably went overboard with the drinking, for I found a puddle of puke in our dining hall, and another puddle in our bathroom. I started cleaning up and picking up all the coins and papers he had strewn around the bathroom's floor. Some of the papers had his puke on them so I wanted to throw them away but not without checking. That was when I saw the receipt which showed that he had paid for '4 ladies' drinks - 6 shots'. I confess at that point in time, I felt a little annoyed but I didn't think it was worth making a fuss over this. 
The next day, I showed him the receipt and teased him about buying drinks for other girls. I jokingly interrogated him and while he initially denied it, he eventually confessed that these were some random Japanese girls they met at the Japanese bar. He and the boys bought them drinks and just chit-chatted with them. I jokingly teased him a little more and left it as that.
As serendipity would have it, later that afternoon, I used his phone to check the Internet for some hangover remedies for him, as I was lazy to walk all the way to the living room for my own phone. When I opened the safari browser, the page landed on google translate, where he had put in the word 'I love u' to be translated to some foreign language.  That got me off and I confronted him again. He said that he was just 'mucking around' and he didn't do anything with them, and that he was honest. 
I do believe that he hasn't done anything beyond the flirting but I still feel lousy about the situation. I had trusted in him. I think that his saying 'I love you' to another girl had crossed the line. He's looks ashamed and says he's sorry but I feel that his apology is insufficient to pacify my feelings.  I told him that he's a jerk for doing this when I have been carrying his child for the last 9 months in a very difficult pregnancy.
I'm still feeling quite upset now but at the same time, feel that it would be blowing the matter out of proportions to take him to task any further. I'm so confused and hurt. Sigh. Is this just the hormones, I wonder....