First of all, the reason why your boyfriend has such a change is related to his frustration in starting a business.

Before the start-up was frustrated, he devoted himself wholeheartedly to it. In order to get sponsorship and support from others, he must be very modest. In this way, when we are in trouble, we can ask our relatives and friends for help.

But after his business was frustrated, the reason for this change may be that he began to give up on himself a little, and with his quick thinking and clever tongue, he began to brag everywhere. Talk big. In fact, he is trying to hide his inner pain and loss.

Therefore, as his girlfriend, we should find an opportunity to talk with him calmly, listen to his real thoughts, enlighten him in time, and let him get out of his disappointment and return to the right track.

These are my suggestions for reference only.

I hope my answer can help you and make you satisfied.

Finally, I wish you a happy life and a happy family