Advice please

My husband and myself of 20yrs separated at the beginning of the summer over my husbands excessive drinking and turning to other places for female attention. Whilst he says nothing happened other than the one message that I found and even though I am leaning on believing him. It still broke my heart. I have never in the whole 20 years doubted him and trusted him whole heartedly. In the last couple of months or so things have been getting better, I see the light and I don’t hate being around him. We spoke about him coming home in time if things keep improving. Over Christmas he has been at the house, sleeping in a different room but I could tell he was making more of an effort around the house and being genuinely being a nicer person.

Last night I chat with a friend and decided I was ready to really try again and tonight we would sit down I was going to tell him to come home. Let be a family again

Today whilst shopping with our 10yr old daughter I brought up his 40th birthday coming up and what should we do to celebrate and what presents. She then informs me that he was going away on holiday with friends for his birthday.

After a phone call I find out he his going to Benidorm with the boys and he booked it when we were separated.

Bear in mind we haven’t been abroad as a family for 7 years and he hasn’t once attempted to even take me out for a day or dinner. It was my birthday a couple of weeks ago and I got some boots.

Again a feel broken. I need him to be able to see how this has hurt me so much and why. For once I just want to be his priority.

Or am I being over sensitive ? tl;dr

Do I have the right to be angry he booked a boys holiday?